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. Author manuscript; available in PMC: 2010 Jun 21.
Published in final edited form as: Am J Prev Med. 2007 Jan;32(1):1–10. doi: 10.1016/j.amepre.2006.08.028

Table 2.

Sociodemographic and behavioral characteristics of participants at randomization

Participant characteristics Control (IO) n=414 Treatment (IPC) n=416 p value
Age (years) 0.44a
 Mean (SD) 29.45 (7.66) 29.8 (7.51)
 Median 28 28
Race 0.21c
 Black/not Hispanic 205 (49.5%) 187 (45%)
Marital status 0.83c
 Single 209 (50.5%) 214 (51.4%)
Education 0.21*
 Grades 1–11 125 (30.2%) 105 (25.2%)
 Grade 12 or GED 145 (35%) 166 (39.9%)
 College 1+ yrs. 141 (34.1%) 144 (34.6%)
Income 0.43c
 <$20,000 221 (53.4%) 235 (56.5%)
AUDIT score 0.41a
 Mean (SD) 17.48 (10.01) 17.81 (9.69)
 Median 15.5 16
Average number of drinks per week past 90 days 0.35a
 Mean (SD) 37.08 (58.96) 35.59 (55.54)
 Median 16.96 18.04
Number of binge episodes past 3 months 0.06a
 Mean (SD) 29.09 (29.96) 30.06 (28.71)
 Median 19 22
Average number of drinks per drinking day past 90 days 0.64a
 Mean (SD) 8.01 (8.62) 7.96 (8.48)
 Median 4.99 5.34
DSM-IV criteria alcohol problems 0.86*
 303.90 alcohol dependence 234 (56.5%) 230 (55.3%)
 305.00 alcohol abuse 31 (7.5%) 27 (6.5%)
 V71.09 no diagnosis 91 (22%) 83 (20%)
History of treatment for alcohol-related problems 280 (67.6%) 291 (70%) 0.82a
Drug use in past 12 months 379 (91.5%) 389 (93.5%) 0.34*
Current smoker 299 (72.2%) 316 (76%) 0.30*
Number of sexual partners in past 3 months 0.36a
 Mean (SD) 12.42 (54.23) 7.61 (36.31)
 Median 2 2
Contraception use (past 3 months) 0.88*
 Used contraception, but ineffectivelyb 276 (66.7%) 281 (67.5%)
 Used no contraception 136 (32.9%) 134 (32.2%)
a

p values for differences in means across treatment groups were calculated using the Satterthwaite t-test for log-transformed data.

b

Includes consistent use of contraception method as prescribed by manufacturer.

c

p values are based upon the collapsed two-level covariate.

*

Differences in proportion across treatment groups were tested using the Fisher Exact Test (2-tailed) P-values less than .05 indicated statistically significant difference.

AUDIT, Alcohol Use Disorder Identification Test; DSM-IV, Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition; GED, general equivalency diploma; IO, information only; IPC, information plus counseling.