We will conduct four sensitivity analyses. In the first sensitivity analysis we will include observations with missing values in covariates but with complete outcome data. In the second sensitivity analysis we exclude observations without any reported injury. In the third sensitivity analysis we will calculate ICISS based on all available SRR, regardless of how frequently the corresponding ICD-10 codes occurr in the dataset. Finally, we will calculate ICISS for each patient based only on unique ICD-10 codes, in other words, each ICD-10 code will only be allowed to contribute one SRR to ICISS even if it occurrs more than once in the same patient.