Validity and reliability of short form-12 questionnaire in Iranian hemodialysis patients
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INTRODUCTION: The aim of the study was to assess the validity and reliability of the SF-12 questionnaire in a sample of Iranian patients undergoing hemodialysis.
MATERIALS AND METHODS: One hundred and forty-four hemodialysis patients were included from dialysis centers in Zanjan, Iran, and were asked to complete the SF-12 and SF-36 questionnaires. An initial test-retest reliability evaluation was performed on a sample of 70 patients from the total group, with a retest interval of 14 days. Reliability was estimated by internal consistency and validity was assessed using known-group comparisons and construct validity on the patient group as a whole. A linear regression analysis was used to assess any variation in the physical component summary and mental component summary scores of the SF-36 with the respective component summary scores of the SF-12. In addition, the factor structure of the questionnaire was extracted by performing a confirmatory factor analysis.
RESULTS: Cronbach alpha for physical and mental component summaries were 0.89 and 0.90, respectively. The SF-12 showed a good discriminatory ability between subgroups of patients based on demographic and clinical variables. The confirmatory factor analysis for the original two-factor structure showed a good fit index (chi2 = 23.30, degrees of freedom = 13), goodness-of-fit index = 0.96, and root mean squared error of approximation = 0.079).
CONCLUSIONS: In general, the SF-12 has good psychometric properties and can be used as a shorter version of the SF-36 questionnaire in future studies involving Iranian patients undergoing hemodialysis.
Original language | English |
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Journal | Iranian Journal of Kidney Diseases |
Volume | 5 |
Issue number | 3 |
Pages (from-to) | 175-81 |
Number of pages | 7 |
ISSN | 1735-8582 |
Publication status | Published - Jul 2011 |
- Female, Humans, Iran, Kidney Failure, Chronic, Male, Middle Aged, Patient Satisfaction, Psychometrics, Quality of Life, Renal Dialysis, Reproducibility of Results, Surveys and Questionnaires, Comparative Study, Journal Article, Multicenter Study, Validation Studies
Research areas
ID: 177291859