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B2N: broad-to-narrow antibiotic de-escalation.
| Block | Variables entered | -2 log likelihood (-2LL) | Δ -2LL from previous block | McFadden’s pseudo R² |
| Null | None (intercept only) | 3545.586 | – | – |
| Block 1 | B2N > 60 min within 240 min | 3535.157 | 10.429 | 0.0029 |
| Block 2 | + Charlson Comorbidity Index (CCI) | 3306.855 | 228.302 | 0.0673 |
| Block 3 | + Age | 3286.992 | 19.863 | 0.0729 |
| Block 4 | + Sex | 3286.541 | 0.451 | 0.0731 |
