Table 4.
Results of logistic regression in data combined from Samples I and II.
| Explanatory variables | Patients n (%) |
Controls n (%) |
Adjusted odds ratio†
(95% CI) |
P # (R 2+)§ |
|---|---|---|---|---|
| Samples I + II | 111 | 174 | ||
|
| ||||
| Hair color | ||||
| Dark brown to brown | 24 (21.6) | 85 (48.9) | 1.0 | 0.001 (13.40) |
| Light brown to dark blond | 43 (38.7) | 74 (42.5) | 2.84** (1.45–5.58) | |
| Blond to strawberry blonde/red | 44 (39.6) | 15 (8.6) | 10.82*** (4.71–24.87) | |
| Eye color | ||||
| Dark color | 35 (31.5) | 69 (39.7) | 1.0 | 0.55 (0.20) |
| Mixed color | 27 (24.3) | 37 (21.3) | 1.73 (0.85–3.56) | |
| Light color | 49 (44.1) | 68 (39.1) | 1.22 (0.66–2.25) | |
†Odds ratios were adjusted for age, sex, and smoking (P values for these covariates were 0.001, 0.001, and 0.018, resp.); # P for trend; §explained variance (%) by the respective variable (Nagelkerke R 2+); *significance for odds ratios: **P < 0.01, ***P < 0.001.