Table 3 Multivariate logistic model, excluding interactions (adjusted by cumulative alcohol intake, leaving the cigarette on the lip, warts and phototype, and age)
Cases n (%) | Controls n (%) | Crude OR (95% CI) (adjusted by age) | Adjusted OR (95% CI) | |
|---|---|---|---|---|
Tobacco | ||||
Nonsmoker | 2 (1.9) | 39 (16.3) | 1 (reference) | 1 (reference) |
First quartile (<135 560 cigarettes) | 12 (11.4) | 48 (20.1) | 5.0 (0.98–47) | 2.4 (0.4–13.1) |
Second quartile <274 540 cigarettes) | 25 (23.8) | 51 (21.3) | 9.6 (2.1–86.9) | 7.7 (1.4–40.7) |
Third quartile (<455 402 cigarettes) | 38 (36.2) | 51 (21.3) | 14.5 (3.3–129.7) | 9.25 (1.8–48.3) |
Fourth quartile (⩾455 402 cigarettes) | 28 (26.7) | 50 (20.9) | 10.9 (2.5–98.7) | 5.32 (0.94–30.1) |
Eye colour | ||||
Black-dark brown | 16 (15.2) | 95 (39.8) | 1 (reference) | 1 (reference) |
Hazel, green, blue, grey | 89 (84.8) | 144 (60.3) | 3.7 (2.0–7.1) | 3.5 (1.5–8.0) |
Sun exposure, outdoor work (April–September) | ||||
Nonexposed | 1 (1.0) | 37 (15.5) | 1 (reference) | 1 (reference) |
First quartile (<35.4 weeks) | 21 (20.0) | 50 (20.9) | 16.1 (2.3–114.8) | 12.6 (1.2–132.4) |
Second quartile (<68.6 weeks) | 29 (79.1) | 51 (21.3) | 22.9 (3.2–162.9) | 11.7 (1.2–115.5) |
Third quartile (<122.6 weeks) | 23 (21.9) | 51 (21.3) | 18.7 (2.6–133.7) | 12.7 (1.4–118.0) |
Fourth quartile (⩾122.6 weeks) | 31 (29.6) | 50 (20.9) | 25.2 (3.6–179.1) | 11.9 (1.3–108.9) |
Age at first sunburn | ||||
No burn | 99 (94.3) | 203 (84.9) | 1 (reference) | 1 (reference) |
⩽15 years old | 1 (1.0) | 3 (1.3) | 0.7 (0.07–6.6) | 14.6 (0.8–255.1) |
>15 years old | 5 (4.8) | 33 (13.8) | 0.3 (0.1–0.8) | 0.1 (0.03–0.6) |
/ | ||||
Years of study | ||||
>3 | 29 (27.6) | 138 (57.7) | 1 (reference) | 1 (reference) |
⩽3 | 76 (72.4) | 101 (42.3) | 3.4 (2.1–6.1) | 2.2 (1.1 – 4.4) |
