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. Author manuscript; available in PMC: 2009 Oct 1.
Published in final edited form as: Schizophr Res. 2008 Aug 13;105(1-3):201–207. doi: 10.1016/j.schres.2008.06.020

Table 3. Alcohol and Other Substance Use Characteristics of Study Participants.

% N

SCID DSM-IV Diagnosis

Alcohol
Abuse 5 4
Dependence 95 76

Cannabis
Abuse/Dependence 34 27

Cocaine
Abuse/Dependence 31 25
Mean SD Median IQR (25 –75) Possible range
ASI
Alcohol Composite .53 .21 .54 .39 – .69 0 – 1
Days of drinking/30 days (N=80) 14.9 8.7 14.0 7.0 – 22.5 0–30
Days of drinking to intoxication/30 days (N=80) 13.6 9.2 12.0 5.3 – 20.8 0–30
Days of cocaine use/30 days (N=25 cocaine users) 2.1 4.7 0.0 0–2.0 0–30
Days of cannabis use/30 days (N=40 cannabis users) 6.2 9.7 0.5 0–20.0 0–30
TLFB (baseline week)
No. of drinking days/wk(N=80) 3.1 2.4 3.0 1 – 5 0–7
No. of drinks per week (N=80) 31.5 36.5 19.4 2.7 – 48.6 n/a
No. of heavy drinking days/week (N=80) 2.1 2.3 1 0 – 4 0–7
No. of drinks per drinking day (N=63 alcohol users in past week) 10.8 11.7 8.4 4.4 – 13.3 n/a
Reported Alcohol Craving (N=80) 50.8 31.1 50.0 26.3 – 79.0 0–100
Reported Quality of Alcohol “High” (N=63 alcohol users in past week) 51.1 26.4 54.0 34.5– 70.0 0–100

IQR = Interquartile range

SCID= Structured Clinical Interview for DSM-IV

ASI = Addiction Severity Index. Higher number indicates higher severity.

TLFB = Timeline Followback