Table 2.
Association between serum TCDD levels and time to pregnancy for 278 pregnancies among women who tried to become pregnant after the explosion, Seveso Women’s Health Study, Italy, 1996–1998.
| Crude | Adjusted* | ||
|---|---|---|---|
| N | fOR (95% CI) | fOR (95% CI) | |
| Serum TCDD (ppt) | |||
| Continuous | |||
| log10 TCDD | 278 | 0.81 (0.65, 1.02) | 0.75 (0.60, 0.95) |
| Categorical | |||
| ≤20 | 52 | 1.00 | 1.00 |
| 20.1–44.4 | 76 | 0.96 (0.61, 1.52) | 0.81 (0.52, 1.25) |
| 44.5–100 | 75 | 0.88 (0.57, 1.36) | 0.71 (0.46, 1.09) |
| >100 | 75 | 0.76 (0.50, 1.16) | 0.63 (0.42, 0.96) |
| Extrapolated TCDD (ppt) | |||
| Continuous | |||
| log10 TCDD | 278 | 0.77 (0.61, 0.96) | 0.73 (0.58, 0.94) |
| Quartiles | |||
| <6.0 | 70 | 1.00 | 1.00 |
| 6.0–14.2 | 69 | 1.45 (0.95, 2.22) | 1.49 (0.95, 2.33) |
| 14.3–40.7 | 70 | 1.00 (0.66, 1.52) | 0.95 (0.61, 1.47) |
| >40.7 | 69 | 0.79 (0.53, 1.17) | 0.76 (0.49, 1.17) |
*
Adjusted for parity, maternal and paternal age, irregular menstrual cycle, oral contraceptive use in past year, smoking, and history of gynecological or chronic health condition.