Skip to main content
Fig. 2 | Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine

Fig. 2

From: Outcomes after helicopter versus ground emergency medical services for major trauma--propensity score and instrumental variable analyses: a retrospective nationwide cohort study

Fig. 2

Risk difference in the in-hospital mortality between HEMS and GEMS. PS, propensity score; IPTW, inverse probability of treatment weighting; IV, instrumental variable; HEMS, helicopter emergency medical services; GEMS, ground emergency medical services; CI, confidence interval; NNT, number needed to treat

Back to article page

Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine

ISSN: 1757-7241