Table 2
Relative risks (RR) and 95% confidence intervals (95% CI) for by-product total exposure measures and risk of stillbirth
| Exposure | Cases n = 112 | Controls n = 398 | Adjusted RR (95% CI)* | THM adjusted RR (95% CI)† | ||
|---|---|---|---|---|---|---|
| *Adjusted for maternal age, province, income, occupation, and smoking during pregnancy. | ||||||
| †Adjusted for maternal age, province, income, occupation, smoking during pregnancy, and total THM exposure. | ||||||
| Total HAA | ||||||
| No exposure | 27 | 24% | 116 | 29% | 1.00 | 1.00 |
| Tertile 1 (lowest) | 18 | 16% | 94 | 24% | 0.93 (0.46 to 1.89) | 0.85 (0.41 to 1.74) |
| Tertile 2 | 40 | 36% | 94 | 24% | 2.35 (1.27 to 4.34) | 1.91 (0.97 to 3.76) |
| Tertile 3 | 27 | 24% | 94 | 24% | 1.35 (0.70 to 2.63) | 0.94 (0.41 to 2.18) |
| DCAA | ||||||
| No exposure | 30 | 27% | 127 | 32% | 1.00 | 1.00 |
| Tertile 1 (lowest) | 29 | 26% | 91 | 23% | 1.54 (0.82 to 2.88) | 1.28 (0.67 to 2.46) |
| Tertile 2 | 30 | 27% | 90 | 23% | 1.99 (1.05 to 3.76) | 1.45 (0.72 to 2.91) |
| Tertile 3 | 23 | 20% | 90 | 23% | 1.17 (0.60 to 2.31) | 0.66 (0.28 to 1.56) |
| TCAA | ||||||
| No exposure | 32 | 29% | 127 | 32% | 1.00 | 1.00 |
| Tertile 1 (lowest) | 30 | 27% | 91 | 23% | 1.54 (0.83 to 2.87) | 1.31 (0.69 to 2.51) |
| Tertile 2 | 19 | 17% | 90 | 23% | 1.13 (0.57 to 2.24) | 0.87 (0.41 to 1.84) |
| Tertile 3 | 31 | 28% | 90 | 23% | 1.52 (0.82 to 2.83) | 1.02 (0.48 to 2.20) |
| Brominated HAA | ||||||
| No exposure | 37 | 33% | 151 | 38% | 1.00 | 1.00 |
| Tertile 1 (lowest) | 19 | 17% | 83 | 21% | 1.15 (0.59 to 2.23) | 1.03 (0.52 to 2.03) |
| Tertile 2 | 27 | 24% | 82 | 21% | 1.43 (0.77 to 2.66) | 1.24 (0.65 to 2.37) |
| Tertile 3 | 29 | 26% | 82 | 21% | 1.60 (0.88 to 2.89) | 1.29 (0.67 to 2.49) |
