Table 4.
Odds ratios of spontaneous abortion among logistic regression model of first pregnancies
| Pregnancy | SA | Crude logistic | Adjusted logistica | |||
|---|---|---|---|---|---|---|
| (N = 2242) | (N = 98) | OR | (95% CI) | OR | (95% CI) | |
| The job held longest | ||||||
| FAB | 1285 | 54 (4.2) | 1.40 | 0.60–3.31 | 1.15 | 0.46–2.85 |
| PKG | 759 | 38 (5.0) | 1.69 | 0.70–4.05 | 1.34 | 0.52–3.41 |
| Clerical worker | 198 | 6 (3.0) | 1.0 | 1.0 | ||
| Age at conception (years) | ||||||
| ≤29 | 1886 | 71 (3.8) | 1.0 | 1.0 | ||
| 30–34 | 326 | 21 (6.4) | 1.76 | 1.07–2.91 | 1.31 | 0.70–2.47 |
| ≥35 | 30 | 6 (20.0) | 6.39 | 2.53–16.12 | 4.18 | 1.40–12.43 |
| Duration of employment (years) | ||||||
| ≤4 | 664 | 24 (3.6) | 1.0 | 1.0 | ||
| 5–9 | 1167 | 48 (4.1) | 1.14 | 0.69–1.89 | 0.95 | 0.56–1.58 |
| ≥10 | 411 | 26 (6.3) | 1.80 | 1.02–3.18 | 1.30 | 0.63–2.67 |
| Year of conception | ||||||
| ≥2009 | 1275 | 82 (6.4) | 1.0 | 1.0 | ||
| ≤2008 | 967 | 16 (1.7) | 0.24 | 0.14–0.42 | 0.32 | 0.18–0.55 |
FAB fabrication process worker, PKG package process worker
OR odds ratio, CI confidence interval
Values displaying significant differences are shown in bold (p-value ≤ 0.05)
aAdjusted for age, BMI, education, smoking, duration of employment, year of conception, study plant