Table 1.

Median (20th-80th percentile) of number of nevi on the back at 12 years of age and time spent outdoors during the previous summer (6 months before)

nAll childrenBoysGirls
No. nevi on back1,08210 (5-17)11 (6-19)8 (4-15)
Time spent outdoors between 11 a.m. and 2 p.m. (min/d)97022.5 (8.0-61.1)23.0 (8.0-66.4)22.0 (8.0-58.9)
Total time spent outdoors between 8 a.m. and 5 p.m. (min/d)970106.6 (44.1-220.8)112.9 (52.5-241.1)96.6 (39.1-204.3)
Time spent outdoors between 11 a.m. and 2 p.m. (% total time)96024.9 (10.6-41.7)24.6 (10.4-39.0)25.1 (10.9-44.4)