The Michigan Alcoholism Screening Test (MAST) was administered to 129 male and
102 female prison inmates. Use of the usual classification rule for the MAST
resulted in 71% and 65% of the samples classified as
“alcoholic”, far higher than the incidence of alcoholism
in studies which used overseas prisoners. Item analyses conducted with these
data, and reconsideration of data from previous New Zealand studies using the
MAST, indicate that it is a sound detection instrument. The high incidence of
alcoholism here therefore probably reflects the high sensitivity of the MAST by
comparison with assessment procedures based on traditional alcoholism criteria,
although New Zealand offender groups seem to score higher than comparable
overseas offenders and the classification rule may be slightly too liberal.
Accordingly, the use of a higher cut-off score seems appropriate when using MAST
score in classifying individuals. A higher cut-off score still resulted in
around 50–60% of inmates being classified as alcoholics. The likely
benefits of rehabilitative efforts within the criminal justice system focusing
on alcohol abuse are discussed.