Characteristics of hospitals treating patients in each volume category
| High volume | Intermediate-high volume | Intermediate-low volume | Low volume | Total cohort | p Value | |
|---|---|---|---|---|---|---|
| N | 15 | 82 | 126 | 34 | 257 | |
| Mean annual volume | 276 (SD 37.5) | 150 (SD 34.5) | 59 (SD 22.6) | 5.2 (SD 6.0) | 79.1 (SD 72.6) | <0.001* |
| Hospital bed size | 348.8 (SD 142.7) | 229.3 (SD 145.8) | 137.9 (SD 100.3) | 109.3 (SD 117.6) | 305.0 (SD 158.7) | <0.001* |
| Trauma centre† | ||||||
| Level 1 | 2 (12.5%) | 7 (8.4%) | 6 (4.5%) | 1 (0.3%) | 16 (6.0%) | |
| Level 2 | 3 (18.8%) | 21 (25.3%) | 10 (7.8%) | 0 (0.0%) | 34 (12.8%) | |
| Level 3 | 1 (6.3%) | 3 (3.6%) | 13 (9.8%) | 0 (0.0%) | 17 (6.4%) | |
| Level 4 | 0 (0.0%) | 0 (0.0%) | 3 (2.2%) | 1 (0.3%) | 4 (1.5%) | |
| Non-trauma centre | 10 (62.5%) | 52 (62.7%) | 100 (75.8%) | 32 (94.1%) | 194 (73.2%) | <0.001‡ |
| Rural setting | ||||||
| Yes | 0 (0.0%) | 5 (6.1%) | 18 (14.3%) | 8 (23.5%) | 31 (12.1%) | |
| No | 15 (100.0%) | 77 (93.9%) | 108 (85.7%) | 26 (76.5%) | 226 (87.9%) | <0.001‡ |
| Teaching hospital | ||||||
| Yes | 11 (73.3%) | 57 (69.5%) | 103 (81.7%) | 27 (79.4%) | 198 (77.0%) | |
| No | 4 (26.7%) | 25 (30.5%) | 23 (18.3%) | 7 (20.6%) | 59 (23.0%) | <0.001‡ |
*Kruskall-Wallis one-way analysis of variance.
†Five institutions changed trauma centre designation between 2007 and 2012.
‡χ2 Test.