Skip to main content

Table 4 Changes in self-report of substance use in the 30 days prior to intervention for PFL versus IAU in North Carolina

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

  Condition   Wald χ2 (df = 1)a
  IAU ( n=64) PFL ( n=128) Time Time X group
  Preintervention Postintervention Preintervention Postintervention F (df) p F (df) p
  Peak number of drinks in a day b
0 20.3% 23.4% 15.5% 12.4% 2.29 .13 7.25 <.007
1-3 29.7% 31.3% 35.7% 20.2% (1, 379)   (1, 379)  
≥4 50.0% 45.3% 48.8% 67.4%     
  Usual number of drinks b
0 19.0% 14.3% 15.5% 11.6% 20.97 <.001 0.96 .330
1-3 58.8% 50.7% 67.4% 51.9% (1, 191)   (1, 191)  
≥4 22.2% 35.0% 17.1% 36.5%     
Per week marijuana/other drug use
Never 92.3% 83.1% 92.2% 86.0% 15.01 <.001 0.77 .313
≤1x 3.1% 9.2% 7.0% 11.7% (1, 192)   (1, 192)  
≥2x 4.6% 7.7% 0.8% 2.3%     
  1. Note: Group, Time, and Time X Group effects were estimated from GEE analysis.
  2. aThe Time and Time X Group effects were of primary interest. Group effects for peak number of drinks, usual number of drinks, and per week marijuana/other drug use: F = 2.43, df = 1,105, p = .122; F = 0.02, df = 1,192, p = .894; F = 1.02, df = 1,192, p = .313.
  3. bFor parsimony, the 46, 79, 1012, and 13+ drinks categories were collapsed into one category representing high risk drinking.