Table 1.

General subject characteristics by p53 immunoreactivity of the skin; Nambour Skin Cancer Prevention Trial, 1996

Subject characteristicNumber of subjects% p53-positive cells in the whole epidermis, median (25% percentile, 75% percentile)% p53-positive cells in the basal layer of the epidermis, median (25% percentile, 75% percentile)
Sex
 Male788a (4, 22)10a (5, 22)
 Female615a (2, 13)7a (2, 11)
Age group, y
 30–39737 (3, 21)9 (4, 20)
 40–49189 (4, 13)9 (5, 20)
 50–592211 (3, 25)10 (5, 28)
 60–69196 (1, 11)6 (2, 12)
 ≥7074 (3, 9)4 (4, 8)
Skin color
 Fair809 (4, 20)9 (4, 21)
 Medium526 (3, 15)8 (4, 13)
 Olive73 (3, 16)6 (2, 12)
Propensity to sunburn
 Always burn347 (2, 17)7 (4, 17)
 Burn then tan967 (3, 16)9 (4, 17)
 Only tan99 (4, 34)9 (6, 25)
Cigarette smoking
 Current smoker208 (2, 33)9 (3, 50)
 Former smoker437 (4, 18)13 (7, 33)
 Never smoker767 (2, 15)9 (4, 20)
Time spent outdoors on a typical week day during the past 6 months, h
 <1537b (3, 13)8a (4, 12)
 2–4505b (2, 12)7a (2, 12)
 5–83011b (6, 36)16a (6, 34)
 9–12522b (9, 42)24a (14, 50)
Time spent outdoors on a typical weekend day during the past 6 months, h
 <1214b (2, 13)5b (3, 11)
 2–4846b (3, 14)8b (3, 14)
 5–83216b (6, 30)17b (7, 39)
 9–1219b14b
Skin cancer history before or during the trial
 No1117 (3, 19)9 (4, 20)
 Yes287 (3, 13)8 (4, 15)
  • aP < 0.01 for group differences.

  • bP < 0.05 for group differences.