Crude and adjusted associations of serum total DDT with any long menstrual cycle (>40 days) in the year before
| Exposures | n (%) | Long cycle | |
|---|---|---|---|
| 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) | 13 (11.2) | 1.00 (reference) | 1.00 (reference) |
| 2nd quartile (n = 117) | 7 (6.0) | 0.50 (0.19 to 1.31) | 0.50 (0.19 to 1.36) |
| 3rd quartile (n = 117) | 15 (12.8) | 1.16 (0.53 to 2.57) | 1.06 (0.45 to 2.48) |
| 4th quartile (high) (n = 116) | 6 (5.2) | 0.43 (0.16 to 1.18) | 0.49 (0.17 to 1.41) |
| Trend (n = 466) | p = 0.34 | p = 0.46 | |
| Linear DDT (per 10 ng/g) | 41 (8.8) | 0.91 (0.75 to 1.10) | 0.92 (0.74 to 1.14) |