Table 4 Odds ratios for stillbirths and maternal characteristics using gestational age at first ANC visit in trimesters (Model 1) and as a continuous variable (Model 2)
Variables | Model 1 | Model 2 |
|---|---|---|
aOR (95% CI) | aOR (95% CI) | |
Number of observations | 27,713 | 27,713 |
Gestational age at first ANC visit (Continuous) | -- | 1.01 (0.99-1.04) |
Gestational age at first ANC visit (Trimester) | ||
1 st Trimester (ref) | 1.00 | -- |
2 nd Trimester | 0.78 (0.39-1.59) | -- |
3 rd Trimester | 1.03 (0.50-2.13) | -- |
Parity | ||
Nulliparous (ref) | 1.00 | 1.00 |
Primi/Multiparous | 1.20 (0.77-1.86) | 1.20 (0.77-1.86) |
Education | ||
None or primary (ref) | 1.00 | 1.00 |
Secondary or tertiary | 0.68 (0.34-1.38) | 0.68 (0.34-1.37) |
Missing | 0.77 (0.32-1.85) | 0.76 (0.32-1.84) |
Race | ||
Coloured (ref) | 1.00 | 1.00 |
Black | 2.03 (1.33-2.10)a | 2.01 (1.31-3.07)a |
Other | 2.42 (0.86-6.82) | 2.43 (0.86-6.83) |
Smoking | ||
Non-smoking (ref) | 1.00 | 1.00 |
Smoking | 1.10 (0.66-1.84) | 1.10 (0.66-1.84) |
Missing | 0.61 (0.30-1.25) | 0.61 (0.30-1.25) |
Maternal age (continuous) | 1.03 (1.00-1.07)a | 1.03 (1.00-1.07)a |