Fig. 1

Risk of melanoma among non-Hispanic white, postmenopausal women according to ultraviolet radiation (UVR) exposure and a age at menarche and b oral contraceptive (OC) use. Solar ambient UVR points represent quartiles of exposure (J/m2). Trend and interaction P values are based on UVR quartile (coded continuously 1–4). P for interactions are 0.02 for age at menarche and 0.09 for OC use. Lines plotted using continuous UVR