Fig. 4From: Association of cigarette smoking habits with the risk of prostate cancer: a systematic review and meta-analysisForest plot for the association between former smoking and prostate cancer. a Rohrmann et al. [49] had two sub-populations. b RR and 95% CI were calculated using frequency distributions. c RR and 95% CI were converted from HR and corresponding 95% CI using the formula RR ≈ (1-e HR x ln (1−P0))/P0 (P0 refers to the incidence rate of PCa in the control group). d Weights were from random effects analysisBack to article page