Table 1. Overview of variables in the original datasets.

Variable	Type	Possible values
Name*	Open text
Age	Continuous
Sex	Categorical	Male / Female
Mechanism of injury	Categorical	Object fall on patient
		Trapped in rubble
		Fall from height
		Other
Date of Admission	Date
Date of Discharge	Date
Diagnosis	Open text
Surgery Type	Categorical	Neurosurgery
		Orthopaedics surgery
		Plastic surgery
		Wound care
		Other
Surgery detail	Free text
Comments on discharge	Free text

* this variable was solely used for merging datasets, and removed immediately after