through July of 1998. As part of this effort, staff requested that SR passengers (the
drinking-driver only) submit to a breath test. SR users were paid $10 for providing a
breath sample and were not allowed to participate in more than one such assessment.
Ninety-eight percent of the drinking drivers agreed to take the breath test (1 out of 52
riders refused).
RESULTS
Barroom Surveys
As can be seen in Table 1, there were no statistically significant differences between SR
users and non-users on gender or ethnic/racial group. They did differ, however, on three
other demographic variables. SR users tended to be younger, to earn less, and were less
likely to be married or living with a partner than were non-users. Additional bivariate
analyses (see Table 2) found significant differences between SR users and non-users on
three drinking variables. First, SR users drank more often outside the home in the last 12
months (M = 72 times) than did non-users (M = 38 times). Secondly, SR users achieved
higher estimated ``usual'' BACs when drinking outside of the home (a mean of .10 vs. .05
for non-users). The third significant difference between SR users and non-users was that
SR users were more likely than non-users (81% vs. 42%) to be classified as heavy drinkers
on the QFV index. Although the comparisons were not statistically significant, SR users
appeared to be more at risk than non-users on two other drinking variables. SR users drank
more often in general (M = 124 times in the last year) than did non-users (M = 76 times),
and SR users were more likely to be defined as problem drinkers on the CAGE measure
(20%) than were non-users (13%).