When possible, weights were initially calculated for each of the four-character principal diagnosis codes listed in the 10th revision of the International statistical classification of diseases and related health problems (ICD-10)20 and then mapped to each of the 47 injury groups used in the GBD 2013 study,11 each of the 39 EUROCOST classification groups21 and each of the European Injury Data Base groupings.22 The ICD-10 codes for the cases from the USA were derived from the ICD-9 codes used in the data set. The Dutch data set only categorized injuries into the European Injury Data Base groupings. Although we could recategorize the Dutch patients into the injury groups used in the GBD 2013 study, we could not use the data from these patients to estimate weights for individual ICD-10 diagnosis codes.