Sensitivity and heterogeneity analysis of pooled relative risks of VTE for smokers.

ap-Value for I2.bStudies reporting estimates that adjusted for at least one confounding factor.cLarge prospective cohort studies with sample size over 15,000.dStudies with population over 1 million by Hippisley-Cox J and Sweetland S [26],[29].eStudies with largest RR by Dreyer NA for ever smokers, by Hansson PO for current smokers and by Zhu J for former smokers [20],[30],[43].