Table 3

Drug use at baseline: Comparison of means between treatment and control groups.

Control Group N = 523
 Drug Ed Group N = 435
 Significance Level
Drug Use Variable
 Mean
 Mean
 t
 df
 p valuea
B1 Cigarettes (frequency)
 1.38
 1.45
 -0.962
 850
 0.336
B2 Smokeless tobacco
 1.38
 1.34
 0.634
 951
 0.526
B3 Cigarettes (amt. smoked)
 1.51
 1.62
 -1.047
 956
 0.295
B4 Alcohol
 1.64
 1.51
 1.611
 955
 0.107
B5 Being drunk
 1.28
 1.31
 -0.408
 866
 0.684
B6 Marijuana
 1.24
 1.22
 0.326
 944
 0.744
B7 Marijuana (amt. smoked)
 1.19
 1.21
 -0.332
 894
 0.740
B8 Sniffed glue
 1.11
 1.11
 0.132
 876
 0.895
B9 LSD
 1.03
 1.05
 -0.672
 802
 0.502
B10 Amphetamines
 1.07
 1.13
 -1.404
 731
 0.161
B11 Crack
 1.05
 1.07
 -0.836
 804
 0.403
B12 Cocaine
 1.06
 1.07
 -0.247
 922
 0.805
B13 Tranquiller
 1.08
 1.10
 -0.513
 790
 0.608
B14 Barbiturates
 1.08
 1.10
 -0.699
 732
 0.485
B15 Crystal Meth
 1.04
 1.07
 -0.829
 769
 0.407
B16 Amphetamine w/o Rx
 1.09
 1.08
 0.022
 907
 0.982
B17 Heroin
 1.02
 1.05
 -1.078
 654
 0.281
B18 Other Narcotics
 1.07
 1.08
 -0.257
 866
 0.798
B19 Ecstasy
 1.07
 1.06
 0.463
 904
 0.644
B20 Roofies
 1.02
 1.06
 -1.087
 588
 0.277
B21 GHB
 1.02
 1.04
 -1.126
 532
 0.261
B22 Super K
 1.02
 1.05
 -1.013
 626
 0.311

a Controlling for baseline differences by using an analysis of covariance with a Type III sums of squares, The t-test df is corrected for unequal variances.

Lennox and Cecchini Substance Abuse Treatment, Prevention, and Policy 2008 3:8   doi:10.1186/1747-597X-3-8

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