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Table 1 Preintervention versus postintervention comparisons of PFL participants’ reports of their substance use in the 30 days before preintervention

From: Reports of past alcohol and drug use following participation in a motivation enhancing intervention: Implications for clinical assessment and program evaluation

  Percent Time3
  Preintervention Postintervention Wald χ2 p
    (df = 1)  
Peak drinks1    656.37 <.001
 0 drinks 35.3% 28.9%   
 1-3 drinks 22.9% 17.7%   
 4-6 drinks 17.2% 17.2%   
 7-9 drinks 9.1% 11.8%   
 10-12 drinks 7.0% 9.6%   
 13+ drinks 8.4% 14.8%   
Usual drinks1    615.34 <.001
 0 drinks 34.8% 27.8%   
 1-3 drinks 35.9% 30.0%   
 4-6 drinks 17.1% 22.0%   
 7-9 drinks 6.2% 10.1%   
 10+ drinks 6.0% 10.1%   
Marijuana or other drug use2    317.90 <.001
 Never 85.5% 78.7%   
 1x/week or less 7.3% 11.1%   
 More than 1x week 7.2% 10.2%   
  1. 1N = 8,387.
  2. 2N = 8,366.
  3. 3Estimated from GEE analysis.