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.

Additional Metadata
Keywords Methodology, Prediction modelling, Predictive factors
Persistent URL dx.doi.org/10.1186/s13049-017-0454-1, hdl.handle.net/1765/103098
Journal Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine
Citation
Sewalt, C.A. (Charlie A.), Wiegers, E.J.A. (Eveline J.A.), Venema, E, & Lingsma, H.F. (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