Risk Scorea | Total Number | Controls (N = 343) | Cases (N = 342) | OR (95% CI) | P-value |
|---|
0 | 259 | 172 | 87 | – | – |
1 | 330 | 150 | 180 | 2.37 (1.69–3.32) | < 0.001 |
2 | 82 | 20 | 62 | 6.13 (3.48–10.80) | < 0.001 |
3 | 14 | 1 | 13 | 25.70 (3.31–199.70) | 0.002 |
- aThe cumulative individual risk score for each mother was calculated as the sum of values (0 for negative or 1 for positive) for each significant risk factor (long working hours, stress and maternal age). Maternal age was classified as 1 for values ≥30 years old and as 0 for values < 30 years old (30 years was the median value for mother age at childbirth in our dataset)
