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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
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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
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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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