Passive smoking and risk of type 2 diabetes: a meta-analysis of prospective cohort studies.
OBJECTIVE
The prevalence of diabetes is increasing rapidly all over the world. However, studies on passive smoking and type 2 diabetes have not been systematically assessed. Therefore, we conducted a meta-analysis to explore whether an association exists between passive smoking and risk of type 2 diabetes.


METHODS
We searched PubMed, EMBASE, Cochrane library and Web of Science up to April 9(th), 2013, to identify prospective cohort studies that assessed passive smoking and risk of type 2 diabetes. The fixed-effect model was used to calculate the overall relative risk (RR).


RESULTS
4 prospective cohort studies were included for analysis, with a total of 112,351 participants involved. The pooled RR was 1.28 (95% confidence interval (CI) 1.14 to 1.44) comparing those who were exposed to passive smoking with those who were not. Subgroup, sensitivity analysis and publication bias test suggested the overall result of this analysis was robust.


CONCLUSIONS
Passive smoking is associated with a significantly increased risk of type 2 diabetes. Further well-designed studies are warranted to confirm this association.
School of Public Health, Wuhan University, Wuhan, PR China.
Ying
Y
Wang
Jie
J
Ji
Yu-jian
YJ
Liu
Xuan
X
Deng
Qi-qiang
QQ
He
D003924:Diabetes Mellitus, Type 2 / Q000453:epidemiology*; D006801:Humans; D008297:Male; D011446:Prospective Studies; D039781:PubMed; D017594:Publication Bias; D012307:Risk Factors; D014028:Tobacco Smoke Pollution / Q000009:adverse effects*
D014028:Tobacco Smoke Pollution