Simeonsson Et Al. 2003

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    Applying the International Classification of

    Functioning, Disability and Health (ICF) to

    measure childhood disabilityR. J. SIMEONSSON{ M. LEONARDI{, D. LOLLAR},E. BJORCK-AKESSON}, J. HOLLENWEGER# andA. MARTINUZZI+*

    { School of Education & FPG Child Development Institute, CB #8185, UNC, Chapel Hill, NC

    27599-8185, USA

    { Italian National Neurological Institute Carlo Besta, Milan, Italy. World Health

    Organization, Geneva, Switzerland

    } National Center on Birth Defects and Developmental Disabilities, Centers for Disease

    Control and Prevention, Atlanta, Georgia, USA

    } Malardalen University, Vasteras, Sweden# Pa dagogische Hochschule Zu rich, Department of Research and Development, Zurich,

    Switzerland

    + E Medea, Conegliano Research Centre, Conegliano, Italy

    Accepted for publication: May 2002

    Abstract

    The International Classification of Functioning, Disability andHealth-ICF addresses the broad need for a common languageand classification of functioning and disability. A parallel needis appropriate measures compatible with the content of theICF to document the nature and impact of limitations offunction, activities and participation. The interaction ofdevelopmental characteristics and disability among childrenrepresent special challenges for classification as well asmeasurement. Demographic trends emphasize the need foruniversal measures that encompass the components of the ICFand can be used in surveillance, screening and evaluation. Thispaper identifies issues related to application of the ICF tomeasure disability in childhood; reviews approaches and toolsto assess childhood disability and identifies priorities for thedevelopment of measures of functioning and disability inchildren based on the ICF. The development of measuresshould be framed within a framework of childrens rights andapplication of the biopsychosocial model to document profilesof functioning and disability of children.

    Introduction

    A mentally or physically disabled child should enjoy

    a full and decent life in conditions which ensure

    dignity, promotes self reliance and facilitates the

    childs active participation in the community (UN

    Convention on the Rights of the Child, 1989,

    Art23.Sec1.)

    The International Classification of Impairments,

    Disabilities and Handicaps (ICIDH1) represented a

    significant achievement at that time in several ways.

    First, it advanced a new approach, conceptualizing

    disability as the consequences of underlying health

    conditions attributable to disease or injury. Second it

    differentiated these consequences at three distinct planes

    of human experience at the levels of body, person and

    society. Third, by differentiating these terms concep-

    tually and semantically, the ICIDH emphasized that

    disability was not uni-dimensional but was manifested

    at different levels of human functioning in the form of

    impairments, performance limitations and the experi-

    ence of disadvantage. Fourth, it provided a taxonomy

    in which numeric codes could be used to document the

    elements unique to each of the three levels with applic-ability for clinical and administrative purposes.

    While the 1980 ICIDH raised awareness of the impor-

    tance of distinguishing between disease and its conse-

    quences in the form of disability, it was an

    experimental document and not widely adopted as a

    classification. Further, there was recognition that it* Author for correspondence;e-mail: [email protected]

    DISABILITY AND REHABILITATION, 2003; VOL. 25, NO. 1112, 602610

    Disability and Rehabilitation ISSN 09638288 print/ISSN 14645165 online # 2003 Taylor & Francis Ltdhttp://www.tandf.co.uk/journals

    DOI: 10.1080/0963828031000137117

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    was limited in a number of ways. The need to revise the

    ICIDH was based on considerations related to policy,

    concepts and application. From a policy perspective,

    the need for a revision of the ICIDH could be seen as

    reflecting the paradigm shift of disability from one based

    on a medical framework toward one reflecting social

    dimensions of disability. The disability advocacy move-

    ment was supportive of defining disability in terms ofaccess restrictions. From a conceptual perspective, this

    policy shift was paralleled by recognition of the crucial

    role of the environment in defining human functioning.

    This was evident in the negative reaction to the linear

    and causal model presented in the 1980 ICIDH, linking

    impairments, disabilities and handicaps without

    accounting for the role of the environment. The ICIDH

    framework was seen as too deterministic, failing to

    reflect the dynamic nature of functioning and disable-

    ment. A further conceptual issue pertained to framing

    classification elements within the perspective of pathol-

    ogy. Lastly, there were at least two practical concerns.

    One was the overlap of content across the three levelsof the classification. A second was growing dissatisfac-

    tion with the negative term and concept of handicap.

    These and other factors provided the impetus for a

    multi-year effort to revise the ICIDH in the 1990s.

    The revision process addressed the identified shortcom-

    ings of the ICIDH through the collective efforts of six

    collaborating centers, three task forces and representa-

    tives from various countries. Task forces addressed (a)

    mental and behavioural issues, (b) environmental factors

    and (c) childrens issues. The task force on children

    generated recommendations for taxonomic entries rele-

    vant for children and youth in the production of Beta

    1 and Beta 2 versions of the ICIDH revision. With repre-

    sentatives of collaborating centres and other task forces,

    the childrens task force also participated in evaluation

    activities of the revision versions of the ICIDH. The

    result of the revision process was the International Clas-

    sification of Functioning, Disability and Health-ICF

    approved by the World Health Assembly in 2001.2

    An essential requirement for implementing effective

    health planning and intervention programmes for indivi-

    duals with disabilities is a common language to docu-

    ment components of functioning and development.

    The ICF provides that common language and a univer-

    sal standard to classify components of functioning anddisability. Paralleling recognition of the need for a

    common classification has been recognition of the need

    for appropriate measures to document the nature and

    impact of these health conditions associated with perso-

    nal and social limitations. The publication of the ICF

    provides a unique opportunity to identity existing

    assessment measures compatible with the content of

    the ICF components as well as to identity instruments

    that need to be developed based on the ICF framework.

    The limited availability of measures based on an inter-

    national taxonomy to assess functional limitations

    among children has been recognized.3 Given the dispro-

    portionate prevalence of disability in developing coun-

    tries and the fact that children constitute the largestpercentage of those with functional and developmental

    limitations,4 emphasizes the need for universal measures

    that are brief and effective for use in surveillance and

    screening. The purpose of this paper is to: (a) identify

    issues related to application of the ICF to measure

    disability in childhood (b) review selected assessment

    measures of disability in childhood and (c) identify prio-

    rities for the development of measures to assess dimen-

    sions of functioning and disability in children based on

    the ICF.

    The revision process and development of the ICF

    reflected a conceptual shift from a consequence of

    disease classification to a components of health classifi-cation (p.2).2 This shift is evident in an examination of

    the revised content of ICF. The classification encom-

    passes functioning as universal human experience that

    can be conceptualized and classified at three different

    planes or dimensions: body function and structure, the

    performance of personal activities and participation in

    communal life. The facilitating or restricting role of

    the environment at each of these planes is recognized

    and can be classified as well. The intended uses of the

    ICF include: (a) advancing science through a standard

    nomenclature; (b) documenting intervention eligibility,

    implementation and outcomes; (c) promoting planning

    and policy initiatives and (d) defining individual rights

    and societal responsibilities. The ICF provides major

    coverage of the dimensions of body function and struc-

    ture, of activities such as communication, mobility and

    self-care and of participation such as work and civic life.

    However, coverage of child characteristics is limited

    requiring further consideration of functioning and

    disability of children and their environments during

    the developmental years.5

    ISSUES IN MEASUREMENT OF CHILDHOOD DISABILITY

    A key function of a classification system is its abilityto serve as a framework for the development of assess-

    ment measures reflecting the specified dimensions of that

    classification. The 1980 ICIDH saw some limited use in

    this regard, however most of the applications covered

    the dimension of Handicap and focused on adult popu-

    lations. This was understandable given the fact that the

    Applying international ICF to childhood disability

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    Handicap dimension was in fact set up as a scale lending

    itself to the development of measures such as the

    London Handicap Scale6 and the CRAIG Chart.7 The

    limited application of the 1980 ICIDH to measure

    disability in childhood is consistent with its restricted

    coverage of developmental and behavioural characteris-

    tics of children.3, 8 The challenges of adapting the 1980

    ICIDH for use with children were described in the devel-opment of an experimental scale to measure the dimen-

    sion of handicap in young children.9 The limited utility

    of the 1980 ICIDH to document disability in childhood

    is demonstrated by the minimal coverage of indicators

    relevant to children and youth in regard to play, learn-

    ing and functioning at home and in school and neigh-

    bourhood.3

    With the publication of the ICF taxonomy, reflecting

    a biopsychosocial model of disability, an important

    priority is to examine its promise as a framework for

    the development of assessment measures for children.

    In addition to its promise as a taxonomy for coding

    dimensions of disability, an important contribution ofthe ICF is that it can provide domains for assessment

    as well as specific variables that can serve as items in

    questionnaire and scale construction. To this end an

    examination of the ICF as a guide for measurement of

    disability in children requires a consideration of several

    issues. Three issues of relevance to this paper are, (a)

    differentiating components of childhood disability, (b)

    identifying the purpose of measurement, and (c)

    accounting for the mediating roles of developmental

    and environmental factors on childhood disability.

    Differentiating components of childhood disability

    In scientific and policy contexts, definitions of child-

    hood disability are often characterized by overlap of

    health conditions, diagnoses or etiological factors. Simi-

    larly, eligibility definitions often reflect a mixture of the

    dimensions of impairments of body function and struc-

    ture, activity limitations and restrictions of participa-

    tion. Two legislative descriptions illustrate this overlap

    of dimensions. In her discussion of childrens needs in

    the UK, Braye10 reports that the Childrens Act of

    1989 defines a child as . . . disabled if he is blind, deaf,

    or dumb or suffers from mental disorder of any kind or

    is substantially and permanently handicapped by illness,injury or congenital deformity or such other disability as

    may be prescribed. A similar framework based on a

    medical model is evident in the definition of children

    with disabilities eligible for special education in the

    USA. Under the 1997 Individuals with Disabilities

    Education act,11 children with disabilities are identified

    as (a) children with mental retardation, hearing

    impairments, deafness, visual impairments including

    blindness, deaf-blindness, multiple disabilities, speech

    and language impairments, serious emotional distur-

    bance, orthopaedic impairments, autism, traumatic

    brain injury, other health impairments or specific learn-

    ing disabilities; and (b) who by reason thereof, need

    special education and related services. These two defini-tions from the UK and the USA illustrate that official

    definitions designed to determine access to services often

    encompass multiple components of disability. Viewed

    within the framework of the ICF, the dimensions

    covered in these definitions include etiology, health

    conditions, disorders, impairments, activity limitations

    as well as participation restrictions. A more efficient

    approach for defining eligibility would be to focus on

    the component that encompasses the childs needs for

    services and supports. In the above two examples, the

    nature of the childs needs reflect educational and social

    support services. The focus for social interventions

    would likely entail the dimension of participation.

    Accounting for developmental and environmental factors

    Another area for consideration in applying the ICF

    builds on the person environment interaction implicit

    in the paradigm shift from a medical to a broader bio-

    psychosocial model of disability. As illustrated in Figure

    1, a person environment interaction model requires a

    consideration of the mediating role of developmental

    and environmental factors. A central issue is that chil-

    drens environments change dramatically across the

    stages of infancy, early childhood, middle childhood

    and adolescence. Each of these changes in the environ-

    ments influences the childs interaction through stimula-

    Figure 1 Modelling dimensions of functioning & disability:Child-Environment Interaction.

    R. J. Simeonsson et al.

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    tion and feedback. These interactions frame a develop-

    mental process of the childs acquisition of increasingly

    complex skills involving actions and reactions to the

    physical and social environment. The influence of the

    environment on the childs performance and functioning

    is thus particularly important to document in this phase

    of the life-span.

    The significance of this interactive perspective hasbeen advanced by Helders et al.12 dynamic view of

    disability for pediatrics, characterized by a shift of

    emphasis from medical diagnosis to functional conse-

    quences of health conditions. Within this perspective,

    the focus is on approaching children with disabilities

    in terms of addressing functional developmental

    problems. Along a similar line, Stineman13 has proposed

    a model of human-environment integration consistent

    with a perspective of the persons interaction with the

    environment. The emphasis of this model is to document

    the individuals potential for meaningful physical and

    mental activity.

    Purpose of assessment

    As for defining the purpose for measurement, a key

    consideration is the epidemiological application of

    surveillance and screening to determine the scope of

    childhood disability. A primary goal of surveillance is

    estimation of the prevalence of disability in the popula-

    tion. In such applications, disability is often operationa-

    lized in terms of activity limitations, rather than

    impairments of body function or structures. A good

    example of this emphasis is the analysis of the US

    National Health Interview Survey data relating to child-

    hood disability by Newacheck and Halfon.14 In that

    study, disability was defined in terms of limitations in

    major activities of play for preschool children and

    school performance for older children respectively.

    Based on these definitions, results indicated an overall

    prevalence rate of childhood disability of 6.5%.

    Another example of an epidemiological approach has

    been described by Hoganet al.15 who obtained estimates

    of functional limitations among 5 17 year-old US chil-

    dren using data from the 1994 National Health Inter-

    view Survey on Disability. With measures based on

    combinations of items, estimates of disability were

    12% for any limitation, 10.6% for learning, 5.5% forcommunication, 1.3% for mobility and 0.9% for self-

    care. It was also found that 3.5% had two forms of

    activity limitations and 1.1% had three or more. In a

    subsequent study, incorporating additional national

    survey data, Hogan et al.16 demonstrated that children

    with functional activity limitations experienced higher

    rates of unfavourable outcomes (limited family

    resources, poorer health status, less healthy environ-

    ments and limited access to health services).

    In an international context, Durkin et al .17 have

    developed a set of 10 questions to estimate the preva-

    lence of childhood disability in several developing

    countries. The Ten Questions measure included such

    areas as seeing, hearing, walking and communication.Information was typically obtained from the mother

    or the primary caregiver as the most knowledgeable

    informant. The Ten Questions survey has been admi-

    nistered in a number of countries including Bangala-

    desh, Jamaica and Pakistan. Representative findings

    from studies in Pakistan17 and Bangaladesh18 have

    yielded prevalence estimates 1.9% and 0.9% for serious

    mental retardation. The prevalence estimates for mild

    mental retardation were 6.5% and 1.4% respectively.

    While the validity of the estimates was not questioned,

    differences in prevalence between the two countries

    were considered to reflect possible differences in

    mortality rates and cultural factors such as consangui-neous marriages.

    Screening in order to identify children with disabil-

    ities constitutes a related purpose for measurement.

    Developmental screening is designed to identify chil-

    dren for early intervention to promote the childs

    development and reduce the risk for later disablement

    and secondary conditions.1 9, 2 0 In a comprehensive

    review of literature on this topic, Sonnander21 found

    that developmental screening typically involved chil-

    dren around the age of four with follow-up made in

    the first year of school. The rate of identification

    ranged from 1 6% with predictive rates for sensitivity

    (45 72%) being lower than those for specificity (77

    99%) of screening. While screening can identify chil-

    dren for intervention, Sonnander concluded that the

    process is complicated by the dynamic nature of child

    development and screening instruments that are inade-

    quate in capturing the complex nature of the childs

    functioning. Selecting items for screening that are sensi-

    tive indicators of disability in development is an impor-

    tant task in applying the ICF for epidemiological

    purposes.

    NEED FOR MEASURES OF CHILDHOOD DISABILITY FOR USE

    WITH THE ICF

    Existing measures of childhood disability

    A wide range of measures have been developed to

    measure aspects of disability of children, some devel-

    oped to assess the impact of specific conditions and

    Applying international ICF to childhood disability

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    others designed to capture core dimensions across

    various conditions. It may be of interest to identify

    measures of potential use to assess one or more of the

    components of the ICF. These fourteen measures vary

    in terms of coverage by age range, contents and admin-

    istrative format. The measures are the Ten Questions,17

    the ABILITIES Index,22, 23 the WeeFIM,24 the Parent

    Evaluation of Development ScalePEDS,25

    the GrossMotor Function MeasureGMFM,26, 27 the Cognitive

    Adaptive Test/Clinical Linguistic and Auditory Mile-

    stone ScaleCAT/CLAMS,28 the Questionnaire for

    Identifying Children with Chronic Conditions

    QUICCC,29 the Life Habits AssessmentLIFE-H,30

    the Disability Scales for Childhood and Adolescent

    InjuriesDSCAI,31 the Independent Behavior Assess-

    ment Scale,32 the Educational Needs Questionnaire

    ENS,33 the Short Sensory Profile-SSP,34 the Amount of

    Assistance QuestionnaireAAQ35 and the Pediatric

    Evaluation of Disability InventoryPEDI.36 While a

    detailed analysis of the measures in terms of fit with

    ICF content is outside the scope of this paper, there isbroad correspondence of the measures to one or more

    ICF dimensions.

    A review of the measures indicates that about half

    can be used with children as young as 1 year of age

    with some extending into the adolescent years. From

    an administrative standpoint, four measures can be

    completed by health professionals, whereas 10 involve

    direct caregiver completion with or without an inter-

    view. The comprehensiveness of the measures varies

    substantially with the PEDI being made up of 237

    items whereas the Ten Questions is based on 10 items.

    Two of the measures, the PEDI and the Educational

    Needs Questionnaire, address the domain of the envir-

    onment by including content related to its role in modi-

    fying activities and participation of the child. Most of

    the measures are designed for clinical identification of

    the nature and extent of childrens functional and

    developmental needs. The Ten Questions and the

    QuICCC have been used in household surveys and

    may serve as models for further development of epide-

    miological tools.

    An important priority is the development of efficient

    measures with potential utility as global tools with speci-

    fic reference to the need for efficient measures in devel-

    oping countries. In this regard, different measures arelikely to be needed for surveillance, screening, clinical

    assessment for planning interventions and documenting

    outcomes. To this end, the ICF can serve a very valuable

    function as the standard of reference for defining

    measurement domains and the development of efficient

    instruments.

    DEVELOPMENT OF MEASURES FOR USE WITH THE ICF

    As a World Health Organization classification, the

    ICF serves as the global standard for defining and docu-

    menting disability. With the expanding emphasis on

    evidence based health care in industrialized and develop-

    ing countries,37 there is a corresponding need for func-

    tional assessment measures for screening, clinicalassessment and outcome evaluation. The measures

    reviewed above represent a selected sample of the variety

    of instruments that have been developed to assess func-

    tional limitations in children. The WHO Disability

    Assessment Schedule has been revised in the form of

    WHO-DAS II to reflect the new content of the ICF

    (WHO, 2001), and has been used in studies with adult

    psychiatric populations.38 The WHO-DAS II however,

    does not purport to measure disability in children.

    The development of measures specific to the ICF to

    assess disability in children should be guided by several

    considerations. A primary consideration is an approach

    consistent within a framework of childrens rights. Ofequal importance is the translation of the biopsychoso-

    cial model of disability in the practices for children.

    Third, the goal for the development of measures should

    be to capture profiles of individual differences of chil-

    dren.

    The publication of the UN Convention on the Rights

    of the Child in 1989 provided the blue print for policy

    making on childrens issues39 (p. 243). Key principles

    underlying the convention include the childs rights to

    be the first to receive services, to have their family

    protected, to have a family environment, to be protected

    from exploitation, and to receive education. While these

    principles are often implicit in policies and practice, the

    convention makes them explicit, constituting a universal

    bill of rights for the child.

    Viewed within a framework of universal standards, the

    UN Convention on Rights for Children and the ICF

    complement each other. One defines the rights of chil-

    dren and the second provides the framework for docu-

    menting the dimensions for which those rights are to

    be carried out. These two universal documents are in

    turn complemented by with Rule 2 (#3) of the UN Stan-

    dard Rules for the Equalization of Opportunities, indi-

    cating that a common level should serve as the basis

    for equalization of opportunity for children as for adults.

    Implementing a biopsychosocial model of disability

    The advancement of the biopsychosocial model of

    disability and recognition of the person environment

    interaction is reflected in the broader perspective for

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    defining not just the health of individuals but that of

    groups and the role of environments.40 In such a view,

    a priority needs to be assigned to assessment of the prox-

    imal environments of home, school and community.

    Arguing for primary paediatric care for children with

    disabilities,41 has emphasized the problems of defining

    childhood disability as well as obtaining reliable esti-

    mates. His emphasis on management of children withdevelopmental manifestations of underlying health

    conditions is consistent with the ICF model. The biopsy-

    chosocial model of disability emphasizes that the needs

    of persons with disabilities are not just medical but more

    broadly, social, educational and functional in nature.42

    In some instances it is important to recognize that medi-

    cal treatments may be iatrogenic creating dependency

    and thereby creating further disability and secondary

    conditions.

    Profiling individual differences

    As individualization is central to the design and devel-opment of intervention plans for persons with disabil-

    ities, a key component of clinical assessment is

    measurement that can yield profiles of individual func-

    tional characteristics. The dimensions for measurement

    can incorporate basic neurophysiological processes as

    well as mental and behavioural functions. Such an appli-

    cation was described by Roux et al.43 in a study of 145

    children with autism between 2 and 12 years of age.

    Ratings were obtained on four dimensions; intellectual

    impairment, language disorders, autistic behaviour and

    measures of electrophysiological activity. Multivariate

    analyses yielded five subgroups of children with distinct

    bio-clinical profiles reflecting different combinations of

    age, clinical indicators and electrophysiological data.

    An important application of the ICF is that it can

    contribute to the growing interest in identifying children

    on the basis of functional profiles rather than diagnostic

    labels. In this regard, various approaches have been

    described in which functional profiles of individual chil-

    dren or subgroups of children serve as the basis for iden-

    tification. This approach is especially important in

    education, where categorical identification of students

    becomes barriers to intervention. For a child with speci-

    fic instructional needs, knowledge about the childs

    seeing function, language comprehension and learningability are important. Regardless of labels such as

    mental retardation, deafness and cerebral palsy, all chil-

    dren need much the same carefully planned steps in

    learning how to read, write and solve problems.

    Clinical description and documentation of changing

    functional status over time or with treatment is another

    purpose that needs to be considered in the development

    of measures based on the ICF. This type of application

    can be illustrated by a project of the American Academy

    of Pediatrics to develop measures of functional status to

    document outcomes of children with chronic conditions.

    Sullivan and Olson44 have described the process for

    developing such a measure for children with asthma.

    Seven domains were identified for measurement withitems describing symptoms or functions rated on a 1

    5 point scale. The domains encompassed the childs

    physical symptoms and activity, the social activity of

    the child and family, the emotional impact on child

    and family and the utilization of health care. Comple-

    tion of the scale by parents of 95 children between the

    ages of 5 12 years of age provided good reliability for

    five of the sub-scales. A useful step would be to examine

    the correspondence of the items with the ICF domains

    of body functions and structure, activities and participa-

    tion. While many of the items in this scale were specific

    to the condition of asthma, others were generic and may

    be of value to consider in the development of measuresbased on the ICF for non-specific aspects of disability in

    children.

    Central to the derivation of profiles of individual

    differences is comprehensive coverage of functional

    characteristics and behaviours of children. In this

    regard, Hack45 described the growing use of functional

    measures of health status and QOL measures. Hack45

    has also stressed the importance of distinguishing

    between proximal neonatal impairments such as retino-

    pathy of pre-maturity and distal impairments such as

    cerebral palsy. In this context, there is need for compre-

    hensive measures of child characteristics and a core data

    set with specific reference to indicators defining the

    nature and severity of disability among children and

    youth with disabilities.

    While the issue of comprehensive coverage of child

    characteristics it is important across all periods of

    childhood and adolescence, it is of particular concern

    in the first years of the childs life. As we have noted

    elsewhere5 references to the concepts of developmental

    delay, developmental morbidity and developmental

    vulnerability reflect recognition of the key role of early

    identification and early intervention to prevent further

    disablement. It is essential that the ICF provide cover-

    age of characteristics and behaviours that are mani-fested in the early years. To this end, an examination

    of areas for such coverage in the ICF and associated

    measures is timely. Among areas of particular impor-

    tance are those that reflect developmental progress in

    the early childhood years when change is particularly

    rapid. Representative candidates for expanded cover-

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    age of the ICF are described below and summarized in

    table 1.

    In a review of atypical behaviour in children under

    36 months of age, Mindle46 has described several char-

    acteristics that may be useful to consider for inclusion

    as categories in the ICF version for children with

    implications for related measures. One of these relates

    to organization and regulation of behaviour. Signifi-cant variation in this characteristic may take the form

    of hypersensitivity to social or physical stimuli on the

    one hand and to hypo-sensitivity and under-reaction

    to stimuli on the other. A related characteristic is that

    of sensory modulation in children.34, 47 At one end of

    the continuum, problems are manifested in sensory

    seeking behaviour in the form of excessive touching,

    increased activity and physical movement. At the

    other extreme, sensation avoiding behaviour is mani-

    fested in aggressive and or anticipatory behaviour in

    the form of somatic behaviours. These behaviours

    have been differentiated on the basis of dysfunctional

    modulation to tactile, vestibular and proprioceptivestimuli. Yet another aspect of problems of behaviour

    regulation is that of stereotyped and self-injurious

    behaviour. In a recent study of more than 450 young

    children under 40 months of age served in interven-

    tion programmes, Berkson, Tupa and Sherman48

    found that 4.6% were characterized by stereotyped

    and self-injurious behaviours.

    Specific developmental issues

    Some characteristics of children are very important to

    document but represent a significant challenge to

    measure. Pain is a particular case in point in young chil-

    dren as well as children with severe disabilities.

    McGrath and colleagues49 have noted that pain is a

    common problem among children with severe cognitive

    limitations. Given the childrens difficulty of self-expres-

    sion, parents are the most obvious and reliable source of

    information about the childs experience of pain.

    Sleep problems are often a source of concern in chil-

    drens development with significant variation of sleep

    in terms of duration, pattern or latency to fall asleep.

    Difficulties in going to sleep and staying asleep occur

    with some frequency in children with severe disabil-

    ities.50 In that sleep problems will have negative effects

    on the child as well as the family, documentation of

    the nature and severity of sleep problems is important

    to incorporate in the development of functional assess-

    ment measures. The fact that family factors may influ-ence the establishment and maintenance of sleep

    problems of children reflects the interactive role of the

    caregiving environment on child development and

    disability.

    Complementing the importance of documenting

    child characteristics and behaviour is documentation

    of the environment and its mediating role in disable-

    ment. Within the framework of child-environment

    interactions, Harkness and Super51 have advanced the

    concept of the developmental niche to account for

    the influence of the environment on the health status

    of the child. To define the influence of the environmen-

    tal factors, the developmental niche is characterized bythree components. The first component encompasses

    the physical and social settings in which the child lives.

    Those settings include not only the natural and built

    environment but also the social and cultural practices

    that might exacerbate the effects of disease transmis-

    sion. Customs of child care and child rearing consti-

    tute the second component. The third component is

    defined by the psychology of the care providers, that

    is, the values and beliefs that define parenting prac-

    tices.

    For many children with disabilities, a wide range of

    mechanical or technological devices facilitate the childs

    physical functioning, mobility, communication and

    performance of personal tasks. Some children are

    dependent on technology, needing support of medical

    devices to compensate for impaired body functions.52

    The fact that . . . more systematic, comprehensive and

    causative data on technology dependent children are

    urgently required (p. 332) has implications for the use

    of the ICF to document characteristics of this low-inci-

    dence group.

    Table 1 Potential content areas for ICF for children and youth

    Body function Body structures Activities & participation Environmental factorsQualifiers; inclusion/exclusion terms

    Sensory modulationBehavioural regulationSelf-injurious behaviourStereotypesSleep problems

    WastingStuntingFailure to thrivePrimary and

    secondary dentition

    Object and peer play;Pre-verbal communication;Imitation;Caregiver-child interactionEarly motor activity

    Developmental niche;physical and socialsettings, customs,psychology of caregivers

    Technology dependence

    Reduction of size;Delayed or precocious

    emergence

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    Measurement issues

    Several issues can be identified related to measure-

    ment format in the application of the ICF. One of these

    is the challenge of assessing children who are limited in

    their ability to respond to measures or unable to convey

    information regarding their own experience. A related

    problem is the reliance on parents and caregivers asproxy responders for the child. As illustrated previously

    in the study by Sullivan and Olson44, their measure relied

    on proxy reports of parents. An important priority is the

    development of measures that can directly capture the

    personal experiences and reports of children through

    interview or observation.

    The utility of a restricted number of questions to

    identify children with severe disability has been exam-

    ined in epidemiological17 as well as clinical studies.53

    In the study by Fooks53, infants who received fresh

    frozen plasma for intra-ventricular haemorrhage in

    the neonatal period were followed up at 2 years of

    age based on their assignment to four disability cate-gories: (a) cerebral palsy; (b) developmental quotient

    two standard deviations below the mean; (c) blindness

    or reduced vision, and (d) hearing loss or using a hear-

    ing aid. A 29-item questionnaire was administered to

    clinicians in the study before the infants were 2 years

    of age. On the basis of that questionnaire, a reduced

    set of questions was identified that maximized the

    assignment of children to the four disability categories.

    Four questions were found to identity 56 of 61 children

    with severe disability and yielded a screening specificity

    value of 98.4%. The incidence of disability based on

    the four questions was 12.7% versus 12.2% based on

    evaluation by the clinician. In terms of domains of

    the ICF, three of the questions (motor; vision; hearing)

    are consistent with content of Body Function/Struc-

    tures. The fourth question related to behaviour and

    seems consistent with the Activities domain. The find-

    ings of this study support the search for a limited set

    of indicators that can effectively identify children with

    disabilities. In concert with the content areas reviewed

    earlier, it is important that such indicators are develop-

    mental in nature.

    Conclusion

    The publication of the ICF followed that of the

    Convention on the Rights of the Child by more than a

    decade. If Convention principles are formalized in

    national laws and policies, the ICF holds promise as a

    means whereby the lived aspects of those rights can be

    documented. This means that in practice, the unique,

    developmental needs of children with impairments of

    function, activity limitations and restrictions of partici-

    pation in community life should be documented and

    met through environmental accommodations and the

    provision of support. The issues reviewed in this paper

    have identified areas for consideration to enhance the

    use of the ICF in policy and practice with children. To

    that end, the ICF can serve as a universal standard torealize the rights of children with disabilities under the

    UN Convention on the Rights of the Child.

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