Study | Number of patients | Odds ratio for survival favoring HEMS | 95% confidence interval | Comment |
---|---|---|---|---|
Thomas et al. 2002 [5] | HEMS: 2,292 GEMS: 14,407 | 1.32 | 1.03-1.71 | Blunt trauma patients only |
Brown et al. 2010 [6] | HEMS: 41,987 GEMS: 216,400 | 1.22 | 1.18-1.27 | Standard multivariable regression |
Stewart et al. 2011 [7] | HEMS: 2,739 GEMS: 6,473 | 1.49 | 1.19-1.89 | Cox proportional hazards regression, including a propensity score as a confounding variable |
Sullivant et al. 2011 [8] | HEMS: 10,049 GEMS: 46,695 | 1.64 | 1.45-1.87 | Standard multivariable regression |
Galvagno et al. 2012 [9] | HEMS: 47,637 GEMS: 111,874 | 1.16 | 1.14-1.17 | Results for patients taken to Level I centers only; propensity score matched regression analysis |
Andruszkow et al. 2013 [1] | HEMS: 4,989 GEMS: 8,231 | 1.33 | 1.16-1.57 | Standard multivariable regression |