Table 4.
Performance of the Predictive Model in the Two Cohorts*
| Development Cohort (N=1932) | Validation Cohort (N=1987) | ||||
|---|---|---|---|---|---|
| Risk Group | Number of risk factors | Hospitalization n/N (%) | RR (95% CI) | Hospitalization n/N (%) | RR (95% CI) |
| Low | 0 | 22/461 (4.8)† | 1.0 (referent) | 30/473 (6.3)‡ | 1.0 (referent) |
| Intermediate | 1 – 2 | 167/1143 (14.6)† | 3.1 (2.0, 4.8) | 184/1191 (15.5)‡ | 2.4 (1.7, 3.6) |
| High | ≥ 3 | 110/328 (33.5)† | 7.0 (4.5, 11.1) | 115/323 (35.6)‡ | 5.6 (3.8, 8.4) |
*
RR=relative risk; CI=confidence interval. Includes imputed values for marital status for 11 subjects in development cohort and 9 subjects in validation cohort.
†
χ2trend = 115.6, P<0.0001
‡
χ2trend = 1151.3, P<0.0001