The aim of this Letter to the Editor was to report some methodological shortcomings in a recently published article. Issues regarding missing values and overfitting are mentioned. First, Complete Case (CC) analysis was used instead of an imputation method. Second, there was a high chance of overfitting and lack of model validation. In conclusion, the results of this study should be interpret with caution and further research is necessary.

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doi.org/10.1186/s13049-017-0454-1, hdl.handle.net/1765/103098
Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine
Department of Public Health

Sewalt, C.A. (Charlie A.), Wiegers, E.J.A. (Eveline J.A.), Venema, E., & Lingsma, H. (2017). Letter to the Editor regarding the article: "identifying pre-hospital factors associated with outcome for major trauma patients in a regional trauma network: An exploratory study". Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine, 25(1). doi:10.1186/s13049-017-0454-1