Table 3.
Results of Kaplan-Meier Survival Analysis for Neuroanatomical Low-, Intermediate- and High-Risk Groups
| Variable | Low Risk | Intermediate Risk | High Risk | χ2 (P) |
|---|---|---|---|---|
| Psychosis-free survival time: median (95% CI; range) [mo] | 50.5 (37.4–54.0; 75.3) | 48.5 (26.9–49.7; 85.1) | 4.9 (6.2–24.3; 75.6) | 17.33 (<.001) |
| Transition rate (95% CI) [%] | 8.3 (3.3–30.8) | 37.5 (21.1–57.4) | 87.5 (68.2–97.3) | 29.04 (<.001) |
| Pairwise log-rank tests [χ2 (P)] | ||||
| Low risk | — | 5.38 (.020) | 31.60 (<.001) | — |
| Intermediate risk | 5.38 (0.020) | — | 12.96 (<.001) | — |
| Center composition of risk groups [N (%)] | ||||
| Munich | 10 (40.0) | 12 (50) | 14 (58.3%) | 1.65 (.469) |
| Basel | 15 (60.0) | 12 (50) | 10 (41.7%) | |
Note: Medians of psychosis-free survival times/transition rates were compared using median/chi-square tests. Pairwise difference between survival curves were evaluated by means of log-rank test. Finally, possible center × risk group interactions were assessed using the chi-square statistic. Italicized values indicate significant findings at an alpha level of 0.05.