Table 3.
Results of logistic regression in Sample II.
| Explanatory variables | Patients n (%) |
Controls n (%) |
Adjusted odds ratio†
(95% CI) |
P # (R2+)§ |
|---|---|---|---|---|
| Sample II | 58 | 38 | ||
|
| ||||
| Hair color | ||||
| Dark brown to brown | 12 (20.7) | 25 (65.8) | 1.00 | 0.001 (8.10) |
| Light brown to dark blond | 23 (39.7) | 10 (26.3) | 2.36 (0.44–12.78) | |
| Blond to strawberry blonde/red | 23 (39.6) | 3 (7.9) | 29.11*** (3.78–224.32) | |
| Eye color | ||||
| Dark color | 14 (24.1) | 13 (34.2) | 1.00 | 0.58 (0.09) |
| Mixed color | 17 (29.3) | 6 (15.8) | 2.06 (0.30–14.19) | |
| Light color | 27 (46.6) | 19 (50.0) | 1.70 (0.35–8.32) | |
| Skin color | ||||
| Dark | 15 (25.9) | 17 (44.7) | 1.00 | 0.68 (0.02) |
| Medium | 19 (32.8) | 13 (34.2) | 1.43 (0.30–6.82) | |
| Light | 24 (41.3) | 8 (21.1) | 1.43 (0.28–7.41) | |
| Skin phototype | ||||
| Rarely/never burns, tans profusely (V + VI) | 6 (10.3) | 22 (57.9) | 1.00 | 0.04 (0.48) |
| Burns moderately/minimally, tans moderately (III + IV) | 19 (32.8) | 12 (31.6) | 2.08 (0.43–10.05) | |
| Burns easily, tans never/minimally (I + II) | 33 (56.9) | 4 (10.5) | 6.08* (1.11–33.45) | |
| Handedness | ||||
| Pronounced right-handed | 8 (14.0) | 24 (63.2) | 1.00 | 0.001 (11.40) |
| Moderate right-handed | 20 (35.1) | 11 (28.9) | 22.36** (2.64–189.32) | |
| Bimanual or left-handed | 29 (50.9) | 3 (7.9) | 64.09*** (5.40–760.69) | |
†Odds ratios were adjusted for age, sex, and smoking (P values for these covariates were 0.001, 0.009, and 0.558, resp.); # P for trend; §explained variance (%) by the respective variable (Nagelkerke R 2+); *significance for odds ratios: *P < 0.05, **P < 0.01, and ***P < 0.001.