Alcohol use disorder was identified in three ways. The first was medical diagnosis from the medical registers: ICD-8 codes 571.0, 291, 303, and 980; ICD-9 codes V79B, 305A, 357F, 571A–571D, 425F, 535D, 291, 303, and 980; and ICD-10 codes E244, G312, G621, G721, I426, K292, K700–K709, K852, K860, O354, T510–T519, and F101–F109. The second was registration in the prescription registry for well-recognized drugs to treat alcohol use disorder using the ATC Classification System codes N07BB01, N07BB03, andN07BB04. The third was registration in the suspicion and conviction registers for at least two records of drunk driving (suspicion code 3005, law1951:649 [paragraph 4 and 4A]) or drunk in charge of a maritime vessel (suspicion code 3201, law 1994–1009 [chapter 20, paragraph 4 and 5]).
