All obstetric admissions (n = 1565) | Direct obstetric admissions (n = 1216) | Indirect or coincidental obstetric admissions (n = 349) | Female nonobstetric admissions aged 16–50 years (n = 18,450) | |
---|---|---|---|---|
Discrimination (AUC [95% CI]) | ||||
APACHE II scorea | 0.839 (0.820 to 0.857) | 0.819 (0.795 to 0.840) | 0.839 (0.797 to 0.876) | 0.812 (0.807 to 0.818) |
APACHE II probabilitya | 0.810 (0.790 to 0.829) | 0.737 (0.711 to 0.761) | 0.806 (0.760 to 0.845) | 0.855 (0.850 to 0.860) |
Calibration | ||||
Mortality ratio (95% CI) | 0.245 (0.167 to 0.346) | 0.214 (0.120 to 0.352) | 0.282 (0.163 to 0.453) | 0.907 (0.878 to 0.937) |
Hosmer–Lemeshow | ||||
C statistic (P value) | 166 (< 0.001) | 101 (<0.001) | 47 (<0.001) | 69 (<0.001) |
Cox's regression calibration | ||||
Slope (95% CI) | 0.728 (0.491 to 0.966) | 0.570 (0.277 to 0.863) | 0.937 (0.509 to 1.37) | 1.05 (1.01 to 1.08) |
Intercept (95% CI) | -2.09 (-2.60 to -1.59) | -2.57 (-3.39 to -1.76) | -1.69 (-2.33 to -1.05) | -0.120 (-0.179 to -0.061) |
χ2(2) (P value)a | 140 (<0.001) | 87 (<0.001) | 55 (<0.001) | 57 (<0.001) |