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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 4–6, 7–9, 10–12, and 13+ drinks categories were collapsed into one category representing high risk drinking.