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Original Research Articles

An approach to validation of a multidimensional tool

Authors:

N. S. Gunawardena ,

University of Colombo, LK
About N. S.
Department of Community Medicine, Faculty of Medicine
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R. de A. Seneviratne,

University of Colombo, LK
About R. de A.
Department of Community Medicine, Faculty of Medicine
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T. A. Atauda

University of Colombo, LK
About T. A.
Department of Community Medicine, Faculty of Medicine
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Abstract

Introduction

Short Form Health Survey-36 (SF-36) is a multidimensional measure of general health which has been used extensively in research on many population groups.

 

Objective

To validate SF-36 among lower limb amputee soldiers and a matched group of males, using triangulation.

 

Methodology

SF-36 was assessed among amputee soldiers (135) and matched healthy males (135) for judgmental, convergent-discriminant and construct validity. Judgmental validity assessed appropriateness of translation of conceptual definitions and cultural suitability. Multi-trait Multi-method Matrix technique assessed convergent-discriminant validity against another accepted measure of general health, the Nottingham Health Profile (NHP). Construct validity was assessed by checking whether: SF-36 distinguished expected differences between and within groups; and eight dimensions of SF-36 emerged from confirmatory factor analyses of data of populations studied. Cronbach’s alpha assessed reliability.

 

Result

Judgmental validity was established. Correlations of similar dimensions of SF-36 and NHP were strong while dissimilar dimensions were weak confirming convergent-discriminant validity. Expected differences between and within groups were seen for scores of SF-36. Five factors among amputee soldiers and. six factors among the comparison group were derived from confirmatory factor analyses, which were similar to dimensions of SF-36. Cronbach's alpha for all dimensions exceeded 0.8 for both groups.

 

Conclusion

Triangulation proved that SF-36 was equally valid for both groups. This approach can be adopted to validate multi-dimensional instruments for cross cultural research where criterion validity cannot be assessed.

How to Cite: Gunawardena, N.S., Seneviratne, R. de A. and Atauda, T.A., 2003. An approach to validation of a multidimensional tool. Journal of the College of Community Physicians of Sri Lanka, 8(1), pp.18–26. DOI: http://doi.org/10.4038/jccpsl.v8i1.8302
Published on 30 Dec 2003.
Peer Reviewed

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