Crude and adjusted associations of serum total DDT with any short menstrual cycle (<21 days) in the year before
| Exposures | Short menstrual cycle | ||
|---|---|---|---|
| n (%) | Crude OR (95% CI) | Adjusted* OR (95% CI) | |
| *Adjusted for age, age squared, BMI, education, passive smoke exposure. | |||
| DDT (ng/g) | |||
| 1st quartile (low) (n = 116) | 7 (6.0) | 1.00 (reference) | 1.00 (reference) |
| 2nd quartile (n = 117) | 9 (7.7) | 1.30 (0.47 to 3.61) | 1.15 (0.41 to 3.23) |
| 3rd quartile (n = 117) | 12 (10.3) | 1.78 (0.68 to 4.69) | 1.71 (0.64 to 4.60) |
| 4th quartile (high) (n = 116) | 21 (18.1) | 3.44 (1.40 to 8.45) | 2.78 (1.07 to 7.14) |
| Trend | p = 0.003 | p = 0.016 | |
| Linear DDT (per 10 ng/g) | 49 (10.5) | 1.21 (1.04 to 1.40) | 1.16 (0.99 to 1.36) |