# Comparing the SF-12 and SF-36 Health Status Questionnaires in Patients With and Without Obesity

 Title: Comparing the SF-12 and SF-36 Health Status Questionnaires in Patients With and Without Obesity Author: Wee, Christina C; Davis, Roger B.; Hamel, Mary Elizabeth Note: Order does not necessarily reflect citation order of authors. Citation: Wee, Christina C., Roger B. Davis, and Mary Beth Hamel. 2008. Comparing the SF-12 and SF-36 health status questionnaires in patients with and without obesity. Health and Quality of Life Outcomes 6: 11. Full Text & Related Files: 2270807.pdf (519.3Kb; PDF) Abstract: Objective: To assess how well the SF-36, a well-validated generic quality of life (QOL) instrument, compares with its shorter adaptation, the SF-12, in capturing differences in QOL among patients with and without obesity. Methods: We compared the correlation between the physical (PCS) and mental (MCS) component summary measures of the SF-12 and SF-36 among 356 primary care patients using Pearson coefficients (r) and conducted linear regression models to see how these summary measures captures the variation across BMI. We used model R$$^{2}$$ to assess qualitatively how well each measure explained the variation across BMI. Results: Correlations between SF-12 and SF-36 were higher for the PCS in obese (r = 0.89) compared to overweight (r = 0.73) and normal weight patients (r = 0.75), p < 0.001, but were similar for the MCS across BMI. Compared to normal weight patients, obese patients scored 8.8 points lower on the PCS-12 and 5.7 points lower on the PCS-36 after adjustment for age, sex, and race; the model R$$^{2}$$ was higher with PCS-12 (R$$^{2}$$ = 0.22) than with PCS-36 (R$$^{2}$$ = 0.16). BMI was not significantly associated with either the MCS-12 or MCS-36. Conclusion: The SF-12 correlated highly with SF-36 in obese and non-obese patients and appeared to be a better measure of differences in QOL associated with BMI. Published Version: doi:10.1186/1477-7525-6-11 Other Sources: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2270807/pdf/ Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:4881564 Downloads of this work: