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) |
|
|
| 1st Trimester (ref) |
1.00 |
-- |
| 2nd Trimester |
0.78 (0.39-1.59) |
-- |
| 3rd 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 |
All models are adjusted for parity, education, mother’s age, race, and smoking status.
aOR, Adjusted Odds Ratio.
aIndicates a significant aOR at 5% significance.