BACKGROUND: Self-reported (SR) body mass index (BMI) values are often used to determine @entity28 prevalence. However, individuals frequently overestimate their height and underestimate their weight, resulting in artificially lower @entity28 prevalence rates. These patterns are especially apparent among older adults and overweight individuals. The present cross-sectional study uses nationally representative datasets from five countries to assess the accuracy of SR BMI values in diverse settings. METHODS: Samples of older adults (>= 50  years old) and comparative samples of younger adults (18-49 years old) were drawn from five middle-income countries (China, India, Mexico, Russian Federation, and South Africa) in the World Health Organization's Study on global AGEing and adult health ( @entity12337 ). @entity1 -reported and researcher-obtained height and weight measures were used to calculate SR and measured BMI, respectively. Paired t-tests assessed differences between SR and measured BMI values by country. Linear regressions examined the contribution of measured weight and age to differences between SR and measured BMI. RESULTS: Significant differences between SR and measured BMI values were observed (p   <   0.05), but the direction of these discrepancies varied by country, age, and sex. Measured weight significantly contributed to differences between SR and measured BMI in all countries (p   <   0.01). Age did not contribute significantly to variation in BMI discrepancy, except in China (p   <   0.001). CONCLUSIONS: These results suggest that SR BMI may not accurately reflect measured BMI in middle-income countries, but the direction of this discrepancy varies by country. This has considerable implications for @entity28 -related disease estimates reliant on SR data.

Does BMI generated by self-reported height and weight measure up in older adults from middle-income countries? Results from the study on global AGEing and adult health ( XXXX ).

@entity1 :: ('9606', 'Species') :: ['Participant'] @entity12337 :: ('55511', 'Gene') :: ['SAGE'] @entity28 :: ('MESH:D009765', 'Disease') :: ['obesity']
@entity12337 :: (55511,Gene) :: ['SAGE']
