TABLE 2.
Meta-Analysis Overview: 24 Cohort Studies
| Risk Category | Studies, No. | RR (95% CI) |
| Incident prostate cancer | ||
| Current smoker | 8 | 1.04 (0.87, 1.24) |
| Current smokera | 4 | 1.22 (1.01, 1.46) |
| Current smokerb | 5 | 1.11 (1.01, 1.22) |
| Ex-smoker | 10 | 1.09 (1.02, 1.16) |
| Fatal prostate cancer | ||
| Current smoker | 7 | 1.14 (1.06, 1.19) |
| Current smokera | 8 | 1.30 (1.16, 1.46) |
| Current smokerc | 4 | 1.24 (1.09, 1.40) |
| Ex-smokerd | 6 | … |
Note. RRs = summary relative risk; CI = confidence interval. Ellipsis indicates RR not calculated.
a
Cigarettes per day, highest versus lowest.
b
Years, pack years, highest versus lowest.
c
Pack years, highest versus lowest.
d
Only study that was not homogeneous.