Cases (n = 386) n (%)

Controls (n = 727) n (%)

Age- and sex-adjusted odds ratio (95% CI)

Male sex

201 (52.1)

261 (35.9)

1.89 (1.46, 2.43)

Age in years

35-44

98 (25.4)

281 (38.7)

1

45-54

134 (34.7)

223 (30.7)

1.62 (1.18, 2.23)

55-64

84 (21.8)

136 (18.7)

1.73 (1.21, 2.49)

65-74

70 (18.1)

87 (12.0)

2.24 (1.51, 2.43)

Education

No high school degree

16 (4.2)

32 (4.4)

1

High school degree

70 (18.1)

142 (19.6)

1.18 (0.59, 2.34)

Some college

131 (33.9)

247 (34.0)

1.39 (0.71, 2.72)

Bachelor degree

104 (26.9)

178 (24.5)

1.39 (0.70, 2.72)

Graduate study

65 (16.8)

127 (17.5)

1.20 (0.59, 2.41)

Income

Less than $24,000

42 (11.9)

99 (15.2)

1

$25-34,000

46 (13.0)

95 (14.6)

1.02 (0.61, 1.72)

$35-49,000

60 (17.0)

127 (19.5)

1.07 (0.66, 1.74)

More than $49,000

206 (58.2)

330 (50.7)

1.50 (0.98, 2.28)

Marital status

Married

290 (75.1)

458 (63.0)

1

Widowed

21 (5.4)

41 (5.6)

0.73 (0.41, 1.31)

Divorced

45 (11.7)

154 (21.2)

0.51 (0.35, 0.74)

Separated

7 (1.8)

20 (2.8)

0.58 (0.24, 1.41)

Never married

23 (6.0)

54 (7.4)

0.74 (0.44, 1.26)

Tendency to sunburn

Tan without burn

38 (9.9)

170 (23.6)

1

Mild burn then tan

195 (35.6)

353 (49.0)

2.46 (1.65, 3.67)

Burn and peel

131 (43.4)

171 (23.8)

3.68 (2.39, 5.67)

Severe burn

20 (5.2)

26 (3.6)

3.71 (1.84, 7.46)

Ability to tan

Deep tan

77 (20.0)

164 (22.9)

1

Moderate tan

145 (37.7)

306 (42.7)

1.07 (0.76, 1.52)

Mild tan

121 (31.4)

192 (26.8)

1.57 (1.09, 2.27)

Freckle or no tan

42 (10.9)

55 (7.7)

1.91 (1.15, 3.15)

Number of severe sunburns ages 2-18

None

68 (18.6)

223 (31.9)

1

1-4

127 (34.7)

287 (41.0)

1.62 (1.14, 2.30)

5-9

66 (18.0)

106 (15.1)

2.36 (1.54, 3.62)

10 or more

105 (28.7)

84 (12.0)

4.53 (2.99, 6.85)

Natural hair color at age 15

Dark brown or black

107 (27.7)

297 (40.9)

1

Light brown

117 (30.3)

204 (28.1)

1.69 (1.22, 2.34)

Blond

123 (31.9)

192 (26.5)

1.98 (1.43, 2.75)

Red

39 (10.1)

33 (4.6)

3.75 (2.21, 6.35)

Density of freckles on arms before age 20

None

63 (16.5)

223 (30.9)

1

Few

134 (35.1)

272 (37.7)

1.96 (1.37, 2.80)

Several

62 (16.2)

99 (13.7)

2.74 (1.76, 4.26)

A lot

123 (32.2)

127 (17.6)

4.37 (2.95, 6.48)

Number of raised moles on both arms

None

159 (41.1)

434 (59.9)

1

1

66 (17.2)

144 (19.9)

1.42 (0.99, 2.02)

2

34 (8.9)

50 (6.9)

2.04 (1.25, 3.33)

3 or more

125 (32.6)

97 (13.4)

3.89 (2.78, 5.43)

Prior mole removal

160 (41.9)

218 (30.1)

1.84 (1.41, 2.41)

Number of moles removed

None

222 (58.1)

507 (70.2)

1

1

57 (14.9)

95 (13.2)

1.49 (1.02, 2.16)

2

29 (7.6)

41 (5.7)

1.91 (1.14, 3.21)

3 or more

74 (19.4)

79 (10.9)

2.31 (1.60, 3.33)

Prior non-melanoma skin cancer

69 (18.1)

26 (3.6)

5.21 (3.22, 8.42)