title: A comparative study of criteria for subgrouping alcoholics: the primary/secondary diagnostic scheme versus variations of the type 1/type 2 criteria.
abstract: OBJECTIVE
  This study compared three methods for identifying type 1 and type 2 alcoholism to determine how well the methods agree. It also evaluated the comparability of each of these schemes to the primary/secondary approach to subgrouping alcoholics.
  
  
  METHODS
  Fifty male alcoholic inpatients were given diagnoses of primary alcoholism without antisocial personality disorder or primary antisocial personality disorder with secondary alcoholism on the basis of data from structured interviews. Operationalized criteria for type 1 and type 2 alcoholism from three groups of researchers (Gilligan et al., von Knorring et al., and Sullivan et al.) were also used to designate subgroups of the same subjects.
  
  
  RESULTS
  Subgroups of subjects classified as having type 1 or type 2 alcoholism according to the criteria of von Knorring et al. and of Sullivan et al. showed good levels of agreement, but the criteria of Gilligan et al. yielded poor agreement with those of the other two schemes. Subgroups with type 1 or type 2 alcoholism according to the criteria of Sullivan et al. showed significant overlap with subgroups diagnosed according to the primary/secondary alcoholism scheme: there was 73% concordance between the type 1 subgroup and the subgroup with primary alcoholism and 73% concordance between the type 2 subgroup and the subgroup with primary antisocial personality disorder and secondary alcoholism.
  
  
  CONCLUSIONS
  There is variability in assigning diagnoses of type 1 and type 2 alcoholism with the use of current methods. Also, type 1/type 2 classifications based primarily on age-at-onset factors significantly overlap with the primary/secondary classifications of alcoholics.
authors.affiliation: Department of Psychiatry, School of Medicine, University of California, San Diego.
authors.forename: R M
authors.initials: RM
authors.lastname: Anthenelli
authors.forename: T L
authors.initials: TL
authors.lastname: Smith
authors.forename: M R
authors.initials: MR
authors.lastname: Irwin
authors.forename: M A
authors.initials: MA
authors.lastname: Schuckit
mesh_terms: D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D000428:Alcohol Drinking; D000437:Alcoholism / Q000145:classification* / Q000175:diagnosis / Q000453:epidemiology; D000987:Antisocial Personality Disorder / Q000145:classification / Q000175:diagnosis / Q000453:epidemiology; D015897:Comorbidity; D006760:Hospitalization; D006801:Humans; D008297:Male; D008875:Middle Aged; D010555:Personality Inventory / Q000706:statistics & numerical data; D011569:Psychiatric Status Rating Scales / Q000706:statistics & numerical data; D009626:Terminology as Topic