Table 2.
Hospital admission characteristics and average (25th, 75th percentiles) PM2.5, temperature, and relative humidity for event-days described for the entire cohort and by urbanicity and beta blocker (BB) prescription.
| Characteristic | Unstratified | Urban | Non-urban | No BB | Yes BB |
|---|---|---|---|---|---|
| Index hospitalizations (#) | 49,835 | 24,945 | 24,863 | 35,348 | 14,487 |
| 30-day readmissions (%) | 12,477 (25%) | 6,314 (25.3%) | 6,152 (24.7%) | 8,399 (23.8 %) | 4,078 (28.1 %) |
| Readmissions in 3 days (%) | 4,037 (8.1%) | 880 (3.5%) | 820 (3.3%) | 1143 (3.2%) | 555 (3.8%) |
| Time to readmission, median (d) | 122 | 117 | 126 | 137 | 91 |
| LOS, median (d) | 3 | 3 | 3 | 4 | 3 |
| Time since HF diagnosis, median (d) | 316 | 303 | 329 | 183 | 799 |
| Urbanicity, median (%) | 86.4 | 100 | 10.7 | 87.3 | 80 |
| PM2.5 (μg/m3) | 8.8 (6.3, 12.1) | 9.1 (6.5, 12.4) | 8.6 (6.1, 11.8) | 8.9 (6.4, 12.2) | 8.6 (6.2, 11.8) |
| Temp (°C) | 16.6 (9.1, 23.4) | 16.8 (9.3, 23.5) | 16.5 (9.0, 23.3) | 16.7 (9.2, 23.4) | 16.5 (9.0, 23.3) |
| RH (%) | 67.5 (57.7, 75.6) | 66.6 (57.1, 74.6) | 68.4 (58.3, 76.7) | 67.5 (57.8, 75.7) | 67.3 (57.6, 75.5) |