Item-level psychometrics of the ADL instrument of the Korean National Survey on persons with physical disabilities

Ickpyo Hong, Mi Jung Lee, Moonyoung Kim, Hae Yean Park

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Purpose: The aim of this study is to investigate the psychometrics of the 12 items of an instrument assessing activities of daily living (ADL) using an item response theory model. Methods: A total of 648 adults with physical disabilities and having difficulties in ADLs were retrieved from the 2014 Korean National Survey on People with Disabilities. The psychometric testing included factor analysis, internal consistency, precision, and differential item functioning (DIF) across categories including sex, older age, marital status, and physical impairment area. Results: The sample had a mean age of 69.7 years old (SD = 13.7). The majority of the sample had lower extremity impairments (62.0%) and had at least 2.1 chronic conditions. The instrument demonstrated unidimensional construct and good internal consistency (Cronbach’s alpha = 0.95). The instrument precisely estimated person measures within a wide range of theta values (−2.22 logits < θ < 0.27 logits) with a reliability of 0.9. Only the changing position item demonstrated misfit (χ2 = 36.6, df = 17, p = 0.0038), and the dressing item demonstrated DIF on the impairment type (upper extremity/others, McFadden’s Pseudo R2 > 5.0%). Conclusions: Our findings indicate that the dressing item would need to be modified to improve its psychometrics. Overall, the ADL instrument demonstrates good psychometrics, and thus, it may be used as a standardized instrument for measuring disability in rehabilitation contexts. However, the findings are limited to adults with physical disabilities. Future studies should replicate psychometric testing for survey respondents with other disorders and for children.

Original languageEnglish
Pages (from-to)2867-2875
Number of pages9
JournalQuality of Life Research
Volume26
Issue number10
DOIs
Publication statusPublished - 2017 Oct 1

Fingerprint

Disabled Persons
Activities of Daily Living
Psychometrics
Marital Status
Bandages
Statistical Factor Analysis
Lower Extremity
Rehabilitation
Surveys and Questionnaires

All Science Journal Classification (ASJC) codes

  • Public Health, Environmental and Occupational Health

Cite this

@article{b0e60fd350654375831c2784fb38f366,
title = "Item-level psychometrics of the ADL instrument of the Korean National Survey on persons with physical disabilities",
abstract = "Purpose: The aim of this study is to investigate the psychometrics of the 12 items of an instrument assessing activities of daily living (ADL) using an item response theory model. Methods: A total of 648 adults with physical disabilities and having difficulties in ADLs were retrieved from the 2014 Korean National Survey on People with Disabilities. The psychometric testing included factor analysis, internal consistency, precision, and differential item functioning (DIF) across categories including sex, older age, marital status, and physical impairment area. Results: The sample had a mean age of 69.7 years old (SD = 13.7). The majority of the sample had lower extremity impairments (62.0{\%}) and had at least 2.1 chronic conditions. The instrument demonstrated unidimensional construct and good internal consistency (Cronbach’s alpha = 0.95). The instrument precisely estimated person measures within a wide range of theta values (−2.22 logits < θ < 0.27 logits) with a reliability of 0.9. Only the changing position item demonstrated misfit (χ2 = 36.6, df = 17, p = 0.0038), and the dressing item demonstrated DIF on the impairment type (upper extremity/others, McFadden’s Pseudo R2 > 5.0{\%}). Conclusions: Our findings indicate that the dressing item would need to be modified to improve its psychometrics. Overall, the ADL instrument demonstrates good psychometrics, and thus, it may be used as a standardized instrument for measuring disability in rehabilitation contexts. However, the findings are limited to adults with physical disabilities. Future studies should replicate psychometric testing for survey respondents with other disorders and for children.",
author = "Ickpyo Hong and Lee, {Mi Jung} and Moonyoung Kim and Park, {Hae Yean}",
year = "2017",
month = "10",
day = "1",
doi = "10.1007/s11136-017-1637-y",
language = "English",
volume = "26",
pages = "2867--2875",
journal = "Quality of Life Research",
issn = "0962-9343",
publisher = "Springer Netherlands",
number = "10",

}

Item-level psychometrics of the ADL instrument of the Korean National Survey on persons with physical disabilities. / Hong, Ickpyo; Lee, Mi Jung; Kim, Moonyoung; Park, Hae Yean.

In: Quality of Life Research, Vol. 26, No. 10, 01.10.2017, p. 2867-2875.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Item-level psychometrics of the ADL instrument of the Korean National Survey on persons with physical disabilities

AU - Hong, Ickpyo

AU - Lee, Mi Jung

AU - Kim, Moonyoung

AU - Park, Hae Yean

PY - 2017/10/1

Y1 - 2017/10/1

N2 - Purpose: The aim of this study is to investigate the psychometrics of the 12 items of an instrument assessing activities of daily living (ADL) using an item response theory model. Methods: A total of 648 adults with physical disabilities and having difficulties in ADLs were retrieved from the 2014 Korean National Survey on People with Disabilities. The psychometric testing included factor analysis, internal consistency, precision, and differential item functioning (DIF) across categories including sex, older age, marital status, and physical impairment area. Results: The sample had a mean age of 69.7 years old (SD = 13.7). The majority of the sample had lower extremity impairments (62.0%) and had at least 2.1 chronic conditions. The instrument demonstrated unidimensional construct and good internal consistency (Cronbach’s alpha = 0.95). The instrument precisely estimated person measures within a wide range of theta values (−2.22 logits < θ < 0.27 logits) with a reliability of 0.9. Only the changing position item demonstrated misfit (χ2 = 36.6, df = 17, p = 0.0038), and the dressing item demonstrated DIF on the impairment type (upper extremity/others, McFadden’s Pseudo R2 > 5.0%). Conclusions: Our findings indicate that the dressing item would need to be modified to improve its psychometrics. Overall, the ADL instrument demonstrates good psychometrics, and thus, it may be used as a standardized instrument for measuring disability in rehabilitation contexts. However, the findings are limited to adults with physical disabilities. Future studies should replicate psychometric testing for survey respondents with other disorders and for children.

AB - Purpose: The aim of this study is to investigate the psychometrics of the 12 items of an instrument assessing activities of daily living (ADL) using an item response theory model. Methods: A total of 648 adults with physical disabilities and having difficulties in ADLs were retrieved from the 2014 Korean National Survey on People with Disabilities. The psychometric testing included factor analysis, internal consistency, precision, and differential item functioning (DIF) across categories including sex, older age, marital status, and physical impairment area. Results: The sample had a mean age of 69.7 years old (SD = 13.7). The majority of the sample had lower extremity impairments (62.0%) and had at least 2.1 chronic conditions. The instrument demonstrated unidimensional construct and good internal consistency (Cronbach’s alpha = 0.95). The instrument precisely estimated person measures within a wide range of theta values (−2.22 logits < θ < 0.27 logits) with a reliability of 0.9. Only the changing position item demonstrated misfit (χ2 = 36.6, df = 17, p = 0.0038), and the dressing item demonstrated DIF on the impairment type (upper extremity/others, McFadden’s Pseudo R2 > 5.0%). Conclusions: Our findings indicate that the dressing item would need to be modified to improve its psychometrics. Overall, the ADL instrument demonstrates good psychometrics, and thus, it may be used as a standardized instrument for measuring disability in rehabilitation contexts. However, the findings are limited to adults with physical disabilities. Future studies should replicate psychometric testing for survey respondents with other disorders and for children.

UR - http://www.scopus.com/inward/record.url?scp=85022097185&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85022097185&partnerID=8YFLogxK

U2 - 10.1007/s11136-017-1637-y

DO - 10.1007/s11136-017-1637-y

M3 - Article

C2 - 28685214

AN - SCOPUS:85022097185

VL - 26

SP - 2867

EP - 2875

JO - Quality of Life Research

JF - Quality of Life Research

SN - 0962-9343

IS - 10

ER -