Table 3.
Multivariable analysis of mortality
| Variable | Odds ratio (95% CI) | P-value |
|---|---|---|
| Source | ||
| Operation room | Reference | – |
| Outpatient department | 2.18 (0.76–5.77) | 0.13 |
| Ward | 3.21 (1.48–7.01) | 0.003 |
| OEWS | ||
| Green | Reference | – |
| Yellow | 3.14 (0.68–17.57) | 0.15 |
| Red | 3.66 (1.15–16.96) | 0.04 |
| SpO2 (%) | 0.95 (0.91–0.98) | 0.007 |
| Alert, voice, pain unresponsive | < 0.0001 | |
| Alert/vocal | Reference | |
| Pain/unresponsive | 5.25 (2.64–10.94) | |
| Oxygen at admission | 0.14 | |
| No | Reference | |
| Yes | 1.82 (0.81–3.93) | |
| Vasopressors at admission | 0.008 | |
| No | Reference | |
| Yes | 3.24 (1.32–7.66) | |
AIC = akaike information criterion; FiO2 = fraction of inspired oxygen; OEWS = obstetric early warning score; SpO2 = transcutaneous saturation of hemoglobin. Bold values indicate statistically significant results. Because of collinearity with the OEWS, some variables (temperature, heart rate, respiratory rate, SpO2/FiO2, systolic blood pressure, and diastolic blood pressure) were not included in the model. Other variables (age, hemoglobin, admission during night, and weekend admission) were not included in the model according to unadjusted analysis of mortality. Finally, model selection was performed by AIC reduction.