Multivariate analyses of human factors associated with physiologic changes of the patients
| Variable | Physiologic change (−) | Physiologic change (+) | Univariate p value | Multivariate p value | Odds ratio (95% CI) |
| Unstable patient | |||||
| Yes | 41 (77.4%) | 12 (22.6%) | 0.123 | ||
| No | 133 (86.9%) | 20 (13.1%) | |||
| Human failure found in arrival and hand-off | |||||
| Yes | 43 (71.7%) | 17 (28.3%) | 0.002 | <0.001 | 5.73 (2.20 to 15.00) |
| No | 131 (89.7%) | 15 (10.3%) | |||
| Omission | |||||
| Yes | 85 (93.4%) | 6 (6.6%) | 0.002 | 0.002 | 0.21 (0.08 to 0.58) |
| No | 89 (77.4%) | 26 (22.6%) | |||
| Skill-based error | |||||
| Yes | 45 (93.8%) | 3 (6.3%) | 0.043 | 0.001 | 0.10 (0.02 to 0.40) |
| No | 129 (81.6%) | 29 (18.4%) | |||
| Transported by medical professionals | |||||
| Yes | 55 (75.3%) | 18 (24.7%) | 0.009 | 0.011 | 3.31 (1.31 to 8.34) |
| No | 119 (89.5%) | 14 (10.5%) | |||