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. Author manuscript; available in PMC: 2020 Jun 1.
Published in final edited form as: Addict Behav. 2019 Jan 16;93:86–92. doi: 10.1016/j.addbeh.2019.01.010

Table 1.

Sample Characteristics and Comparability at Pretest (N = 788)

Intervention (n = 396) Control (n = 392)

Variable % M (SD) % M (SD) t or X2 p-value
Age (R = 11 – 15 years)   13.66 (0.67)   13.72 (0.67)  1.365 .173
Ethnic/racial group          1.722 .788
  White 64%   65%      
  Black 24%   25%      
  Hispanic 15%   15%      
  Other 18%   19%      
Average school gradesa   1.69 (0.82)   1.67 (0.83) −0.423 .672
Geographic areab          2.538 .281
  Urban 83%   80%      
  Rural 10%   10%      
  Large Town 7%   10%      
Parents’ education          0.032 .859
  < 2 years of college 49%   50%      
  2 or > years of college 51%   50%      
Past-month drug use:            
  Alcohol use   0.95 (4.45)   1.23 (4.86  0.824 .410
  Binge drinkingc   0.25 (1.23)   0.36 (1.64)  0.999 .318
  Cigarette use    0.89 (5.84) 0.85 (5.55) −0.091 .928
  Marijuana use    0.88 (5.50) 0.76 (4.76) −0.320 .749
  Other drug used    0.97 (5.19)   1.02 (4.16)  0.161 .872

Note. Past-month use of alcohol, cigarettes, marijuana, and other drugs is a count variable and ranges between 0 = 0 times and 71 = 71 or more times.

a

Range is 1 – 5, where 1 = “mostly A’s”, and 5 = “mostly F’s.”

b

According girls’ zip codes and Rural-Urban Commuting Area Codes, a Census tract-based classification system.

c

Four or more drinks within a couple of hours.

d

Use of the following: club drugs, cocaine, ecstasy, hallucinogens, heroin, inhalants, methamphetamines, steroids, and/or prescription drugs