The latest version of the SAS Input Statements for ICD-9-CM External Cause of Injury Morbidity Matrix was downloaded from _tools.htm and used for analysis of ICD-9-CM data. The latest ICD-9-CM nature-of-injury codes,7 ICD-10-CM surveillance case definition for injury hospitalisations,8 and SAS program for the ICD-10-CM External Cause of Injury Matrix were obtained from the NCHS. The following analysis was carried out in two steps: (1) identifying injury cases based on the presence of specific injury diagnosis codes (table 1) in the principal diagnosis field, and (2) searching for valid external cause of injury codes in the following order: all labelled external cause fields, the principal diagnosis field and diagnosis fields other than principal diagnosis, to identify the first listed valid external cause of injury code and to create a table showing injury mechanism/cause by injury intent.
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