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Table 1 Sample characteristics by status^

From: The effects of purchasing alcohol and marijuana among adolescents at-risk for future substance use

  Marijuana user Marijuana and alcohol user
Purchased MJ only Non-purchaser Test statistic** P- value Purchased alcohol & MJ Non-purchaser Test statistic** P- value
n = 78 n = 49 n = 37 n = 27
  Mean (SD)/% Mean (SD)/% Mean (SD)/% Mean (SD)/%
Demographics         
 Age 16.5 (1.0) 16.7 (1.1) 1.35 0.180 17.0 (1.0) 16.9 (0.8) 0.58 0.566
 Male 64.1 69.4 0.38 (1) 0.540 70.3 59.3 0.84 (1) 0.360
 Race    0.74 (2) 0.690    2.97 (2) 0.227
  Hispanic/Latino(a) 42.3 34.7    54.1 33.3   
  White 47.4 53.1    35.1 55.6   
  Other 10.3 12.2    10.8 11.1   
 Alcohol offense 38.5 65.3* 8.68 0.003 59.5 74.1 1.48 (1) 0.224
 MHI-5 (0–100) 72.4 (15.6) 69.9 (20.3) 0.80 0.427 65.6 (20.2) 69.4 (20.1) 0.74 0.461
Alcohol use & consequences         
 Alcohol in the past 30 days 2.5 (1.6) 2.2 (1.4) 1.00 0.321 3.5 (1.6) 2.4 (1.1)* 3.15 0.003
 Heavy drinking in the past 30 days 2.0 (1.6) 1.6 (1.2) 1.30 0.197 2.5 (1.8) 1.5 (1.1)* 2.61 0.011
 Drinks per drinking day 2.5 (3.1) 1.9 (2.4) 1.08 0.283 3.8 (2.9) 2.1 (1.7)* 2.79 0.007
 Number of drinks on max occasion 3.4 (4.4) 2.9 (4.1) 0.66 0.510 6.9 (6.2) 2.9 (3.1)* 3.11 0.003
 Alcohol most used substance 20.5 60.4* 20.61 (1) <.001 43.2 70.4* 4.64 (1) 0.031
 Alcohol-related consequences 1.3 (0.5) 1.2 (0.3) 1.34 0.184 1.4 (0.4) 1.1 (0.2)* 2.88 0.005
Time spent around teens who drink 2.6 (0.9) 2.6 (0.9) 0.10 0.923 3.1 (0.8) 2.8 (0.7) 1.83 0.072
Marijuana or other drug use & consequences         
 Marijuana use in the past 30 days 4.1 (2.3) 2.1 (1.6)* 5.10 <.001 3.8 (2.5) 2.5 (1.9)* 2.35 0.022
 Marijuana-related consequences 1.3 (0.5) 1.1 (0.4)* 2.03 0.045 1.3 (0.5) 1.2 (0.5) 0.98 0.329
Time spent around teens who use marijuana 3.1 (0.8) 2.6 (0.9)* 2.45 0.016 3.2 (0.8) 2.9 (0.8) 1.35 0.182
 Any Rx drug use past 30 days (%) 6.4 0.0   0.156 21.6 0.0*   0.017
Time spent around teens who use other illegal drugs 1.6 (0.9) 1.5 (0.8) 0.72 0.472 2.1 (1.0) 1.5 (0.8)* 2.46 0.017
GAIN past year Intentions to use 1.0 (0.7) 0.4 (0.6)* 5.08 <.001 1.2 (0.6) 0.4 (0.6)* 5.70 <.001
 Intention to use alcohol 2.3 (0.9) 2.0 (0.8) 1.96 0.052 2.6 (1.0) 2.1 (0.6)* 2.44 0.018
 Intention to use marijuana 2.2 (1.1) 1.5 (0.8)* 3.96 <.001 2.3 (1.0) 1.6 (0.7)* 2.87 0.006
Resistance self-efficacy         
 Resistance self-efficacy - alcohol 10.7 (3.5) 12.8 (3.2)* -3.37 0.001 10.8 (3.4) 12.0 (3.1) 1.39 0.169
 Resistance self-efficacy - marijuana 10.9 (4.2) 14.3 (2.4)* -5.27 <.001 11.4 (4.1) 13.8 (2.8)* 2.57 0.013
  1. *p<0.05; ^27 respondents were classified as both a marijuana user, non-purchaser, and a marijuana and alcohol user, non-purchaser. **Reported test statistics are from t-tests for continuous variables and chi-squared tests for dichotomous and categorical variables. Only for prescription drug use did we use a Fisher’s exact test due to small cell counts. For this test only the p-value is reported. Degrees of freedom for marijuana user t-tests are 125 and the degrees of freedom for the dual purchaser t-tests are 62. Degrees of freedom for chi-squared tests are indicated in parentheses after the test statistic.