Unadjusted and adjusted odds ratios for maternal age at menarche and atopy defined by skin prick tests (⩾2 mm)
| Maternal age at menarche(years) | Unadjusted OR (95% CI)n = 5792 | Adjusted OR (95% CI)*n = 5015 |
|---|---|---|
| *Adjusted for sex, maternal education, maternal age at delivery, parity, maternal allergy history, maternal smoking in pregnancy, maternal BMI (continuous), child birth weight (continuous), and skin prick tester. | ||
| <12 | 1.00 (reference) | 1.00 (reference) |
| 12 | 0.95 (0.77 to 1.16) | 0.93 (0.75 to 1.17) |
| 13 | 1.09 (0.91 to 1.31) | 1.11 (0.91 to 1.37) |
| 14 | 0.90 (0.72 to 1.12) | 0.89 (0.71 to 1.13) |
| 15 | 0.93 (0.71 to 1.22) | 0.82 (0.61 to 1.11) |
| 16+ | 1.03 (0.74 to 1.44) | 0.98 (0.68 to 1.42) |
| p value | 0.432 | 0.182 |