Table 1.

Demographic, lifestyle and skin cancer risk factors in SCC cases and controls

Variable	Controls (n = 290)		SCC (n = 168)		p-Value1
	n	(%)	n	(%)
Age in years (mean, [SD])	55.3	(11.7)	64.2	(10.0)	<0.00012
Age
18–39	27	(9.3)	4	(2.4)	<0.0001
40–49	52	(17.9)	10	(6.0)
50–59	102	(35.2)	35	(20.8)
60–69	81	(27.9)	64	(38.1)
70–80	28	(9.7)	55	(32.7)
Sex
Female	181	(62.4)	57	(33.9)	<0.0001
Male	109	(37.6)	111	(66.1)
Education
>12 years	258	(89.9)	117	(78.0)	0.001
≤12 years	29	(10.1)	33	(22.0)
Eye color
Dark brown	79	(27.5)	19	(12.8)	0.003
Blue	81	(28.2)	61	(40.9)
Green	48	(16.7)	23	(15.4)
Hazel	45	(15.7)	30	(20.1)
Light brown	34	(11.9)	16	(10.7)
Hair color
Black/brown	227	(78.6)	98	(65.3)	0.003
Blonde/red	62	(21.5)	52	(34.7)
Job in sun for ≥3 months
No	210	(72.9)	75	(50.0)	<0.0001
Yes	78	(27.1)	75	(50.0)
History of blistering sunburn
No	91	(31.7)	35	(23.5)	0.07
Yes	196	(68.3)	114	(76.5)
Cutaneous sensitivity to season’s first sun exposure
Tan or no change in skin color	42	(14.6)	20	(13.4)	0.001
Mild sunburn turns to a tan	132	(45.8)	44	(29.5)
Sunburn with or without blisters	114	(39.6)	85	(57.1)
Tanning ability to repeated sun exposure
It tans easily	167	(58.6)	55	(36.9)	<0.0001
It can tan if you work at it	96	(33.7)	70	(47.0)
It is unable to tan	22	(7.7)	24	(16.1)
Alcohol consumption
No drinks in past year	37	(12.9)	29	(19.5)	0.07
≥1 drink in the past year	251	(87.2)	120	(80.5)
Ever smoked 100 cigarettes
No	144	(49.7)	46	(30.9)	0.0002
Yes	146	(50.3)	103	(69.1)

This table presents and compares the distribution of demographic, lifestyle, and established skin cancer risk factors between SCC cases and controls.

Abbreviation: SD, standard deviation.

¹p-Value for chi-square test.

²p-Value for Wilcoxon rank sum test.