HRs (95% CIs) of possible factors involved in the incidence of atopic dermatitis until 3 years old
| Factors | Crude HR (95% CI) | Adjusted HR (95% CI) |
| Short versus long sunshine duration | 1.03 (0.99 to 1.08) | ― |
| Low versus high humidity | 1.06 (1.01 to 1.11) | 0.99 (0.95 to 1.04) |
| Birth month between January and March | 1.02 (0.95 to 1.09) | 1.02 (0.95 to 1.09) |
| Birth month between April and June | Reference | Reference |
| Birth month between July and September | 1.06 (0.99 to 1.13) | 1.05 (0.98 to 1.13) |
| Birth month between October and December | 1.20 (1.12 to 1.28) | 1.20 (1.12 to 1.29) |
| Father’s history of allergy | 1.21 (1.16 to 1.28) | 1.18 (1.12 to 1.24) |
| Mother’s history of allergy | 1.70 (1.62 to 1.78) | 1.69 (1.61 to 1.77) |