Table 2.
Adjusted analysis examining factors associated with maternal death at advanced maternal age
| Characteristic | Model A (n = 870)a | Model B (n = 798)b | Model C (n = 369)c | |||
|---|---|---|---|---|---|---|
| Adjusted OR (95% CI) | P‐value | Adjusted OR (95% CI) | P‐value | Adjusted OR (95% CI) | P‐value | |
| Socio‐demographic characteristics | ||||||
| Aged | 1.12 (1.02–1.22) | 0.013 | 1.11 (1.01–1.21) | 0.025 | 1.05 (0.95–1.16) | 0.326 |
| Smoking status | ||||||
| Never/ex‐smoker | 1 | 1 | 1 | |||
| Smoked during pregnancy | 2.06 (1.13–3.75) | 0.019 | 2.04 (1.12–3.74) | 0.020 | 2.03 (0.99–4.14) | 0.052 |
| Missing | 5.69 (1.54–20.98) | 0.009 | 7.04 (0.96–51.76) | 0.055 | ||
| Previous medical history | ||||||
| Pre‐existing medical conditions | ||||||
| None | 1 | 1 | 1 | |||
| Yes | 5.92 (3.56–9.86) | <0.001 | 5.50 (3.30–9.16) | <0.001 | 4.44 (2.48–7.94) | <0.001 |
| Missing | 0.27 (0.05–1.43) | 0.124 | 1.22 (0.08–19.61) | 0.888 | ||
| Previous pregnancy problems | ||||||
| No | 1 | 1 | 1 | |||
| Yes | 2.06 (1.23–3.45) | 0.006 | 2.03 (1.20–3.41) | 0.008 | 1.98 (1.09–3.61) | 0.025 |
| Missing | 3.49 (0.39–30.95) | 0.262 | 0.79 (0.06–11.02) | 0.864 | ||
| Pregnancy‐related characteristics | ||||||
| Inadequate use of antenatal care | ||||||
| No | 1 | 1 | 1 | |||
| Yes | 23.62 (8.79–63.45) | <0.001 | 15.75 (5.58–44.50) | <0.001 | 19.92 (4.95–80.20) | <0.001 |
| Missing | Omittede | Omittede | Omittede | |||
95% CI, 95% confidence intervals; OR, odds ratios.
Each model adjusted for the five variables shown in the table.
a
Model A: main model using proxy variables for missing data.
b
Model B: sensitivity analysis: using complete case analysis.
c
Model C: sensitivity analysis: using UKOSS controls restricted to women delivering between 2009 and 2012.
d
No missing observations.
e
Omitted as no missing values in cases.