Table 1: Distribution of cumulative UV flux ( × 10−4 RB units) according to skin cancer risk factors

From: Cumulative ultraviolet radiation flux in adulthood and risk of incident skin cancers in women

 No. of participants (%)Mean±s.d.Range
Ability to tan after 2 h of sun exposure as a child
Almost none7179 (9)1643±1016200–5362
Little tan18 570 (22)1652±1010200–5392
Average tan37 715 (46)1676±1021200–5340
Deep tan19 383 (23)1692±1031200–5370
Skin reaction after 2 h of sun exposure during childhood
No burn16 263 (19)1692±1026200–5362
Some redness36 456 (44)1679±1023200–5370
Burn18 671 (22)1651±1010200–5392
Painful burn7981 (10)1658±1019200–5296
Painful burn with blisters4425 (5)1647±1032200–5200
Natural hair colour at age 20
Red3519 (4)1638±1021200–5130
Blonde9792 (12)1672±1034200–5392
Light brown32 401 (39)1672±1021200–5362
Dark brown35 480 (42)1673±1017200–5362
Black2557 (3)1689±1036200–5370
Moles count on the left arm
None46 214 (63)1683±1025200–5370
1–223 781 (32)1669±1020200–5328
3–51959 (3)1626±997200–5040
61488 (2)1641±1018200–5296
Lifetime severe sunburn counts
None48 293 (63)1674±1020200–5392
1–216 310 (21)1670±1019200–5296
3–56309 (8)1678±1027200–5182
65788 (8)1654±1023200–5296
Family history of melanoma
No101 972 (94)1682±1030200–5392
Yes6606 (6)1664±1014200–5362
UV index at state of residence at birth
524 892 (33)1636±970200–5296
642 088 (56)1626±973200–5362
77879 (11)2098±1272200–5370
UV index at state of residence at age 15
524 722 (33)1630±965200–5296
642 311 (56)1616±964200–5362
77917 (11)2144±1288200–5370
UV index at state of residence at age 30
520 603 (28)1579±919200–5296
641 942 (57)1575±923200–5296
710 762 (15)2163±1284200–5370
Physical activity level
<3.0 Metabolic equivalents hours per week20 845 (28)1624±1032200–5296
3.0–8.9 Metabolic equivalents hours per week20 032 (27)1643±1007200–5362
9.0–17.9 Metabolic equivalents hours per week14 393 (19)1743±1025200–5296
18.0–26.9 Metabolic equivalents hours per week7919 (11)1791±1023200–5296
27.0 Metabolic equivalents hours per week11 375 (15)1869±1032200–5392
Rotating night shift
Never30 775 (41)1686±1026200–5296
1–9 Years36 222 (48)1676±1020200–5362
10 Years9048 (12)1659±1011200–5296
  1. Abbreviations: RB=Robertson–Berger; UV=ultraviolet.