# Table 3 Group Means at Baseline, and 3-Month and 6-Month Follow-ups

3-Month Follow-up   6-Month Follow-up
Variable Baseline I (N = 198) C (N = 200)   I (N = 196) C (N = 198)
% Entered Treatment Past 90 Days a
Intervention   7.6   10.0
Control   5.5   8.7
Intervention   20.2*   24.2
Control   12.5   18.3
Mean (S.D.) Mean (S.D.) DF Mean (S.D.) DF
# Days Crack Use a,b
Intervention 15.1 (10.4) 8.5 (9.4)*** 196 6.6 (8.9)*** 193
Control 15.2 (10.5) 8.1 (9.3)*** 199 6.3 (8.5)*** 197
# Days Alcohol Use a,b
Intervention 17.3 (11.9) 12.8 (11.1)*** 196 11.5 (10.6)*** 195
Control 17.2 (11.8) 11.9 (10.7)*** 197 12.0 (10.5)*** 197
# Days Drank 5+ Drinks c,d
Intervention 10.3 (11.5) 6.0 (9.0)*** 197 5.7 (9.1)*** 195
Control 10.1 (11.7) 6.3 (9.5)*** 197 5.9 (8.4)*** 197
# Drinks/Day c,d
Intervention 9.3 (11.4) 4.6 (7.6)*** 196 5.2 (9.4)*** 194
Control 6.7 (7.4) 4.3 (4.1)*** 196 4.6 (4.8)** 196
1. *p < .05, **p < .01, ***p < .001
2. aComparisons are between groups
3. bP-values are calculated using Pearson chi-square test
4. cComparisons are from baseline to 3-month follow-up and from baseline to 6-month follow-up
5. dP-values are calculated using paired t-tests'.
6. DF = Degrees of freedom