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Sources of heterogeneity in studies of the BMI-mortality association
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Sources of heterogeneity in studies of the BMI-mortality association
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Journal Article
Sources of heterogeneity in studies of the BMI-mortality association
2017
Overview
To date, the amount of heterogeneity among studies of the body mass index-mortality association attributable to differences in the age distribution and length of follow-up has not been quantified. Therefore, we wanted to quantify the amount of heterogeneity attributable to age and follow-up in results of studies on the body mass index-mortality relation.
We used optima of the body mass index mortality association reported for 30 populations and performed meta-regression to estimate the amount of heterogeneity attributable to sex, ethnicity, mean age at baseline, percentage smokers, and length of follow-up.
Ethnicity as single factor accounted for 36% (95% CI, 11–56%) of heterogeneity. Mean age and length of follow-up had an interactive effect and together accounted for 56% (95% CI, 24–74%) of the remaining heterogeneity. Sex did not significantly contribute to the heterogeneity, after controlling for ethnicity, age, and length of follow-up.
A considerable amount of heterogeneity in studies of the body mass index-mortality association is attributable to ethnicity, age, and length of follow-up.
•The BMI-mortality association varies considerably between study cohorts.•We found ethnicity alone to account for 36% of the heterogeneity.•Age and length of follow-up accounted for 56% of the remaining heterogeneity.
Publisher
Elsevier B.V,Japan Epidemiological Association,Elsevier
Subject
