Table 1.
Select characteristics of the 278 women with a non-contracepted post-explosion pregnancy resulting in a live birth, Seveso Women’s Health Study, Italy, 1996–98.
| Time to Pregnancy | TCDD (ppt) | ||
|---|---|---|---|
| Freq. (%) | Crude fOR (95% CI) | median (IQR) | |
| Total | 278 (100.0) | 49.7 (25, 117) | |
| Maternal age (years) at pregnancy attempt | 25.7 ± 3.8 | 0.99 (0.95, 1.03) | |
| ≤25 | 133 (47.8) | 1.00 | 46.2 (23, 93) |
| 26–30 | 114 (41.0) | 0.97 (0.71, 1.33) | 60.3 (27, 142) |
| 31–35 | 29 (10.4) | 0.76 (0.45, 1.29) | 43.9 (24, 119) |
| ≥36 | 2 (0.7) | 1.09 (0.85, 1.41) | 26.4 (23, 29) |
| Maternal age (years)at explosion | 17.2 ± 6.2 | 0.99 (0.96, 1.01) | |
| 0–10 | 27 (9.7) | 1.12 (0.70, 1.79) | 81.2 (44, 288) |
| 11–20 | 149 (53.6) | 1.00 | 53.4 (28, 112) |
| 21–30 | 94 (33.8) | 0.86 (0.62, 1.21) | 41.2 (22, 85) |
| 31–40 | 8 (2.9) | 2.55 (0.77, 3.14) | 36.6 (26, 115) |
| Maternal age (years) at interview | 37.7 ± 6.2 | 0.98 (0.96, 1.01) | |
| 21–30 | 20 (7.2) | 1.11 (0.66, 1.86) | 92.6 (44, 205) |
| 31–40 | 150 (54.0) | 1.00 | 50.2 (27, 122) |
| 41–50 | 98 (35.3) | 0.83 (0.60, 1.16) | 44.8 (22, 88) |
| 51–60 | 10 (3.6) | 1.94 (0.84, 4.49) | 28.6 (24, 86) |
| Parity at time of explosion | |||
| Nulliparous | 224 (80.6) | 1.00 | 53.5 (28, 124) |
| Parous | 54 (19.4) | 1.12 (0.75, 1.66) | 34.3 (22, 81) |
| Marital status | |||
| No | 17 (6.1) | 1.00 | 45.6 (29, 99) |
| Yes | 261 (93.9) | 0.75 (0.37, 1.50) | 49.9 (25, 117) |
| Education<required | |||
| No | 222 (79.9) | 1.00 | 49.7 (26, 123) |
| Yes | 56 (20.1) | 1.06 (0.72, 1.54) | 49.3 (23, 90) |
| No | 203 (73.0) | 1.00 | 49.9 (27, 123) |
| Yes | 75 (27.0) | 0.76 (0.55, 1.05) | 45.4 (21, 102) |
| OC use past year | |||
| No | 201 (72.3) | 1.00 | 48.0 (24, 93) |
| Yes | 77 (27.7) | 1.16 (0.86, 1.56) | 60.2 (33, 157) |
| Irregular cycle | |||
| No | 247 (88.9) | 1.00 | 50.6 (26, 117) |
| Yes | 31 (11.2) | 0.63 (0.40, 1.00) | 33.3 (15, 122) |
| History of reproductive or endocrine conditions | |||
| No | 247 (88.9) | 1.00 | 49.9 (25, 109) |
| Yes | 31 (11.2) | 0.59 (0.38, 0.90) | 48.7 (22, 163) |
| Paternal Age (years) | 30.2 ± 4.6 | 0.94 (0.91, 0.98) | |
| ≤25 | 34 (12.2) | 1.44 (0.73, 2.84) | 45.0 (26, 124) |
| 26–30 | 133 (47.8) | 1.00 | 52.8 (25, 90) |
| 31–35 | 78 (28.1) | 0.93 (0.67, 1.28) | 51.4 (26, 163) |
| ≥36 | 33 (11.9) | 0.44 (0.27, 0.72) | 41.9 (22, 81) |
| Father zone A/B | |||
| No | 186 (66.9) | 1.00 | 52.9 (27, 135) |
| Yes | 64 (23.0) | 0.90 (0.63, 1.29) | 51.9 (25, 88) |
| Unknown | 28 (10.1) | 1.29 (0.89, 1.88) | 37.5 (12, 67) |