Table 1. Demographic and Clinical Characteristics of Participants With and Without Nonmelanoma Skin Cancer Diagnoses.
| Characteristic | No. (%) | P Value | |
|---|---|---|---|
| Cases | Controls | ||
| All patients | 97 (49) | 100 (51) | |
| Age, mean (SD), y | 70 (11) | 63 (9) | <.001 |
| Sex | |||
| Women | 29 (30) | 54 (54) | .001 |
| Men | 68 (70) | 46 (46) | |
| Smoking frequency | |||
| Frequently | 13 (14) | 12 (12) | .67 |
| Often | 1 (1) | 0 | |
| Sometimes | 1 (1) | 3 (3) | |
| Rarely | 1 (1) | 2 (2) | |
| Never | 80 (83) | 81 (81) | |
| BCC diagnosis | |||
| Yes | 39 (40) | 0 | |
| No | 58 (60) | 0 | |
| SCC diagnosis | |||
| Yes | 32 (33) | 0 | |
| No | 65 (67) | 0 | |
| BCC and SCC diagnoses | |||
| Yes | 26 (27) | 0 | |
| No | 71 (73) | 0 | |
| Hair color | |||
| Red | 8 (8) | 6 (6) | .89 |
| Light blonde | 8 (8) | 8 (8) | |
| Light brown | 33 (34) | 38 (38) | |
| Dark brown | 40 (42) | 38 (38) | |
| Black | 7 (7) | 10 (10) | |
| Eye color | |||
| Blue | 52 (54) | 32 (32) | .01 |
| Brown | 15 (16) | 35 (35) | |
| Gray | 2 (2) | 1 (1) | |
| Green | 15 (16) | 17 (17) | |
| Hazel | 13 (13) | 15 (15) | |
| Skin color | |||
| Ivory | 6 (6) | 3 (3) | <.001 |
| Pale | 75 (77) | 47 (47) | |
| Beige | 10 (10) | 33 (33) | |
| Olive | 6 (6) | 16 (16) | |
| Dark brown | 0 (0) | 1 (1) | |
| Skin cancer family history | |||
| Yes | 61 (63) | 51 (51) | .001 |
| No | 27 (28) | 48 (48) | |
| Unsure | 9 (9) | 1 (1) | |
| Tanning frequency | |||
| Frequently | 6 (6) | 12 (12) | .07 |
| Often | 2 (2) | 11 (11) | |
| Sometimes | 10 (11) | 10 (10) | |
| Rarely | 20 (21) | 17 (17) | |
| Never | 56 (60) | 49 (49) | |
| Burn frequency | |||
| Always | 25 (26) | 8 (8) | .002 |
| Often | 21 (22) | 24 (24) | |
| Sometimes | 25 (26) | 23 (23) | |
| Rarely | 23 (24) | 31 (31) | |
| Never | 3 (3) | 14 (14) | |
| No. of severe sunburns | |||
| 0 | 6 (6) | 8 (8) | .06 |
| 1 | 6 (6) | 6 (6) | |
| 2 | 4 (4) | 14 (14) | |
| 3 | 7 (7) | 13 (13) | |
| ≥4 | 73 (76) | 59 (59) | |
| ApaI genotypes | |||
| AA | 21 (22) | 24 (24) | .03 |
| Aa | 35 (37) | 52 (52) | |
| aa | 39 (41) | 24 (24) | |
| BsmI genotypes | |||
| BB | 28 (29) | 43 (43) | .10 |
| Bb | 48 (50) | 42 (42) | |
| bb | 21 (22) | 15 (15) | |
| TaqI genotypes | |||
| TT | 32 (33) | 45 (45) | .20 |
| Tt | 46 (47) | 41 (41) | |
| tt | 19 (20) | 14 (14) | |
Abbreviations: BCC, basal cell carcinoma; SCC, squamous cell carcinoma.