Table 4 Validation of the CAP-90 index: 90-day mortality in the derivation and validation cohorts by index score categories
Risk group (points)Derivation cohort (n = 1117)Validation cohort (n = 646)p Value†
No who died/no at risk (%)*OR (95% CI)No who died/no at risk (%)*OR (95% CI)
Low risk (0–2)3/428 (0.7)12/358 (0.6)10.80
Intermediate risk (3–7)16/454 (3.5)5.18 (1.50 to 17.89)8/205 (3.9)7.23 (1.52 to 34.36)0.81
High risk (>7)26/151 (17.2)29.47 (8.77 to 98.97)11/56 (19.6)43.50 (9.34 to 202.54)0.66
AUC0.790.82

  • The low-risk group was considered as the reference group.

  • *p<0.001 for the Cochran–Armitage test for trend. †χ2 or Fisher exact tests for comparison of mortality proportion between the derivation and validation cohorts.

  • AUC, area under the receiver operating characteristic curve; OR, odds ratio; 95% CI, 95% confidence interval.