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Related Concept Videos

Intellectual Disability01:29

Intellectual Disability

Intellectual disability (ID) is a neurodevelopmental condition characterized by deficits in intellectual and adaptive functioning that manifest during the developmental period. This condition encompasses challenges in reasoning, memory, problem-solving, and learning, accompanied by impairments in everyday life skills, such as communication, self-care, and social interactions. Intellectual disability affects approximately 1% of the population in the United States, impacting an estimated 5...
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When the population standard deviation is unknown and the sample size is large, the sample standard deviation s is commonly used as a point estimate of σ. However, it can sometimes under or overestimate the population standard deviation. To overcome this drawback, confidence intervals are determined to estimate population parameters and eliminate any calculation bias accurately. However, this only applies to random samples from normally distributed populations. Knowing the sample mean and...
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In practice, we rarely know the population standard deviation. In the past, when the sample size was large, this did not present a problem to statisticians. They used the sample standard deviation s as an estimate for σ and proceeded as before to calculate a confidence interval with close enough results. However, statisticians ran into problems when the sample size was small. A small sample size caused inaccuracies in the confidence interval.
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Measuring the Functional Abilities of Children Aged 3-6 Years Old with Observational Methods and Computer Tools
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Counting disability: global and national estimation.

Nenad Kostanjsek1, Anne Good, Rosamond H Madden

  • 1World Health Organization, Geneva, Switzerland. kostanjsekn@who.int

Disability and Rehabilitation
|June 4, 2013
PubMed
Summary
This summary is machine-generated.

Globally, 15% of the population lives with disabilities, with significant variation in definitions and measurement. Environmental factors greatly impact participation, highlighting the need for a multidimensional approach to disability statistics.

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Area of Science:

  • Public Health
  • Disability Studies
  • Health Statistics

Background:

  • Disability prevalence and measurement vary globally.
  • Accurate and comparable disability data are crucial for policy and resource allocation.
  • The World Health Organization (WHO) and World Bank have addressed these challenges through the World Report on Disability (WRD).

Purpose of the Study:

  • To address key questions on global disability prevalence, definitions, and measurement accuracy.
  • To present findings from the Irish National Disability Survey (2006) as an illustration.
  • To highlight the utility of the International Classification of Functioning, Disability and Health (ICF) framework.

Main Methods:

  • Utilized multiple data sources including the World Health Survey (2002-2004) and Global Burden of Disease study (2004).
  • Employed the ICF as the underlying data standard for global estimations.
  • Compiled country-reported prevalence data from censuses and surveys, alongside the Irish National Disability Survey.

Main Results:

  • An estimated one billion people (15% of the global population) experience disabilities.
  • 110-190 million people (2% of the global population) face severe or extreme functioning difficulties.
  • The Irish Disability Survey demonstrated the significant influence of environmental factors (e.g., attitudes, support services, transport) on participation.

Conclusions:

  • Recommends adopting a common definition and concepts based on the ICF for improved disability information.
  • Advocates for a multidimensional approach to disability measurement, focusing on levels of difficulty across life areas.
  • Emphasizes the integral role of environmental factors in disability measurement and individual functioning.