Skip to main content

Table 1 Summary of studies using multivariate logistic regression to compare HEMS versus GEMS

From: Comparative effectiveness of helicopter emergency medical services compared to ground emergency medical services

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

  1. GEMS, ground emergency medical services; HEMS, helicopter emergency medical services.