| |
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)
|
- aχ2 statistic with two degrees of freedom (and associated P value) from a likelihood ratio test of slope 1 and intercept 0 in Cox's regression calibration model. APACHE, Acute Physiology and Chronic Health Evaluation; AUC, area under the receiver operating characteristic curve; CI, confidence interval.
