Are factor analytical techniques used appropriately in the validation of health status questionnaires?

A systematic review on the quality of factor analysis of the SF-36

Henrica C W de Vet, Herman J Adér, Caroline B Terwee, Francois Pouwer

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Factor analysis is widely used to evaluate whether questionnaire items can be grouped into clusters representing different dimensions of the construct under study. This review focuses on the appropriate use of factor analysis. The Medical Outcomes Study Short Form-36 (SF-36) is used as an example. Articles were systematically searched and assessed according to a number of criteria for appropriate use and reporting. Twenty-eight studies were identified: exploratory factor analysis was performed in 22 studies, confirmatory factor analysis was performed in five studies and in one study both were performed. Substantial shortcomings were found in the reporting and justification of the methods applied. In 15 of the 23 studies in which exploratory factor analysis was performed, confirmatory factor analysis would have been more appropriate. Cross-validation was rarely performed. Presentation of the results and conclusions was often incomplete. Some of our results are specific for the SF-36, but the finding that both the application and the reporting of factor analysis leaves much room for improvement probably applies to other health status questionnaires as well. Optimal reporting and justification of methods is crucial for correct interpretation of the results and verification of the conclusions. Our list of criteria may be useful for journal editors, reviewers and researchers who have to assess publications in which factor analysis is applied.

OriginalsprogEngelsk
TidsskriftQuality of Life Research
Vol/bind14
Udgave nummer5
Sider (fra-til)1203-18; dicussion 1219-21, 1223-4
ISSN0962-9343
StatusUdgivet - jun. 2005

Fingeraftryk

Statistical Factor Analysis
Surveys and Questionnaires
Publications
Research Personnel
Outcome Assessment (Health Care)

Citer dette

@article{02b2e1f25d754cb4b17cc40361333afc,
title = "Are factor analytical techniques used appropriately in the validation of health status questionnaires?: A systematic review on the quality of factor analysis of the SF-36",
abstract = "Factor analysis is widely used to evaluate whether questionnaire items can be grouped into clusters representing different dimensions of the construct under study. This review focuses on the appropriate use of factor analysis. The Medical Outcomes Study Short Form-36 (SF-36) is used as an example. Articles were systematically searched and assessed according to a number of criteria for appropriate use and reporting. Twenty-eight studies were identified: exploratory factor analysis was performed in 22 studies, confirmatory factor analysis was performed in five studies and in one study both were performed. Substantial shortcomings were found in the reporting and justification of the methods applied. In 15 of the 23 studies in which exploratory factor analysis was performed, confirmatory factor analysis would have been more appropriate. Cross-validation was rarely performed. Presentation of the results and conclusions was often incomplete. Some of our results are specific for the SF-36, but the finding that both the application and the reporting of factor analysis leaves much room for improvement probably applies to other health status questionnaires as well. Optimal reporting and justification of methods is crucial for correct interpretation of the results and verification of the conclusions. Our list of criteria may be useful for journal editors, reviewers and researchers who have to assess publications in which factor analysis is applied.",
keywords = "Factor Analysis, Statistical, Health Status Indicators, Humans, Reproducibility of Results, Research, Surveys and Questionnaires, Journal Article, Review",
author = "{de Vet}, {Henrica C W} and Ad{\'e}r, {Herman J} and Terwee, {Caroline B} and Francois Pouwer",
year = "2005",
month = "6",
language = "English",
volume = "14",
pages = "1203--18; dicussion 1219--21, 1223--4",
journal = "Quality of Life Research",
issn = "0962-9343",
publisher = "Springer",
number = "5",

}

Are factor analytical techniques used appropriately in the validation of health status questionnaires? A systematic review on the quality of factor analysis of the SF-36. / de Vet, Henrica C W; Adér, Herman J; Terwee, Caroline B; Pouwer, Francois.

I: Quality of Life Research, Bind 14, Nr. 5, 06.2005, s. 1203-18; dicussion 1219-21, 1223-4.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Are factor analytical techniques used appropriately in the validation of health status questionnaires?

T2 - A systematic review on the quality of factor analysis of the SF-36

AU - de Vet, Henrica C W

AU - Adér, Herman J

AU - Terwee, Caroline B

AU - Pouwer, Francois

PY - 2005/6

Y1 - 2005/6

N2 - Factor analysis is widely used to evaluate whether questionnaire items can be grouped into clusters representing different dimensions of the construct under study. This review focuses on the appropriate use of factor analysis. The Medical Outcomes Study Short Form-36 (SF-36) is used as an example. Articles were systematically searched and assessed according to a number of criteria for appropriate use and reporting. Twenty-eight studies were identified: exploratory factor analysis was performed in 22 studies, confirmatory factor analysis was performed in five studies and in one study both were performed. Substantial shortcomings were found in the reporting and justification of the methods applied. In 15 of the 23 studies in which exploratory factor analysis was performed, confirmatory factor analysis would have been more appropriate. Cross-validation was rarely performed. Presentation of the results and conclusions was often incomplete. Some of our results are specific for the SF-36, but the finding that both the application and the reporting of factor analysis leaves much room for improvement probably applies to other health status questionnaires as well. Optimal reporting and justification of methods is crucial for correct interpretation of the results and verification of the conclusions. Our list of criteria may be useful for journal editors, reviewers and researchers who have to assess publications in which factor analysis is applied.

AB - Factor analysis is widely used to evaluate whether questionnaire items can be grouped into clusters representing different dimensions of the construct under study. This review focuses on the appropriate use of factor analysis. The Medical Outcomes Study Short Form-36 (SF-36) is used as an example. Articles were systematically searched and assessed according to a number of criteria for appropriate use and reporting. Twenty-eight studies were identified: exploratory factor analysis was performed in 22 studies, confirmatory factor analysis was performed in five studies and in one study both were performed. Substantial shortcomings were found in the reporting and justification of the methods applied. In 15 of the 23 studies in which exploratory factor analysis was performed, confirmatory factor analysis would have been more appropriate. Cross-validation was rarely performed. Presentation of the results and conclusions was often incomplete. Some of our results are specific for the SF-36, but the finding that both the application and the reporting of factor analysis leaves much room for improvement probably applies to other health status questionnaires as well. Optimal reporting and justification of methods is crucial for correct interpretation of the results and verification of the conclusions. Our list of criteria may be useful for journal editors, reviewers and researchers who have to assess publications in which factor analysis is applied.

KW - Factor Analysis, Statistical

KW - Health Status Indicators

KW - Humans

KW - Reproducibility of Results

KW - Research

KW - Surveys and Questionnaires

KW - Journal Article

KW - Review

M3 - Journal article

VL - 14

SP - 1203-18; dicussion 1219-21, 1223-4

JO - Quality of Life Research

JF - Quality of Life Research

SN - 0962-9343

IS - 5

ER -