To model the shared variance between the alcohol problem indices (ADS, PACS, Symptom Count, DrInC-2R, and CIWA-Ar) principal components analyses were conducted on the full sample of problem drinkers (n = 295) to derive factor scores capturing alcohol problem severity, as described in detail elsewhere (Ray et al., 2013). Participants’ score on the single factor, labeled alcoholism severity, was used in subsequent analyses.
