Does the single-item self-rated health measure the same thing across different wordings? Construct validity study
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Does the single‑item self‑rated health measure the same thing across different wordings? Construct validity study Stéphane Cullati1,2,3,4 · Naike Bochatay2,5,6 · Clémentine Rossier7 · Idris Guessous8 · Claudine Burton‑Jeangros2 · Delphine S. Courvoisier3,4 Accepted: 13 May 2020 © The Author(s) 2020
Abstract Purpose The self-rated health (SRH) item is frequently used in health surveys but variations of its form (wording, response options) may hinder comparisons between versions over time or across surveys. The objectives were to determine (a) whether three SRH forms are equivalent, (b) the form with the best construct validity and (c) the best coding scheme to maximize equivalence across forms. Methods We used data from 58,023 respondents of the Swiss Health Survey. Three SRH forms were used. Response options varied across forms and we explored four coding schemes (two considering SRH as continuous, two as dichotomous). Construct validity of the SRH was assessed using 34 health predictors to estimate the explained variance. Results Distributions of response options were similar across SRH forms, except for the “good” and “very good” options (“good” in form 1: 58.6%, form 2: 65.0% and form 3: 44.1%). Explained variances differed across SRH forms, with form 3 providing the best overall explained variance, regardless of coding schemes. The linear coding scheme maximised the equivalence across SRH forms. Conclusion The three SRH forms were not equivalent in terms of construct validity. Studies examining the evolution of SRH over time with surveys using different forms should use the linear coding scheme to maximise equivalence between SRH forms. Keywords Self-rated health · Questions wording · Response options · Construct validity · Population health measurement
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Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11136-020-02533-2) contains supplementary material, which is available to authorized users. * Stéphane Cullati [email protected] 1
The self-rated health (SRH) item is frequently used in health surveys but variations of its form (wording, response options) may hinder comparisons between versions over time or across surveys
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Department of Paediatrics, University of California, San Francisco, CA, USA
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Unit of Development and Research in Medical Education, Faculty of Medicine, University of Geneva, Geneva, Switzerland
Population Health Laboratory, University of Fribourg, Fribourg, Switzerland
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Institute of Sociological Research, University of Geneva, Geneva, Switzerland
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Department of Readaptation and Geriatrics, University of Geneva, Geneva, Switzerland
Institute of Demography and Socioeconomics, University of Geneva, Geneva, Switzerland
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Quality of Care Service, Department of Readaptation and Geriatrics, Faculty of Medicine, University of Geneva, Chemin Thury 3, 1206 Geneva, Switzerland
Division of Primary Care Medicine, Department of Primary Care Medicine, Geneva University Hospitals, Geneva, Sw
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