Characteristics of the 3 cohort studies (N = 12,605 cases) and 5 case-control studies (N = 1,295 cases) on physical activity and melanoma risk included in the systematic review and meta-analysis group
Note: Each cell reports sample size for that group. For lifetime smoking history, “none” indicates having never smoked, “moderate” indicates having smoked but fewer than 100 cigarettes, and “heavy” in
