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Table 2 Baseline, follow-up, and change in self-reported substance use by presence of a mental-health diagnosis

From: Self-reported alcohol and drug use six months after brief intervention: do changes in reported use vary by mental-health status?

Measure

Mental health diagnosis

No mental health diagnosis

P-value*

 

Mean # days in prior 30

Mean # days in prior 30

 

Any alcohol days

   

Statewide regression sample (n=468)

   

  Baseline

9.7

9.0

0.48

  Follow-up

3.9

4.3

0.60

  Change (follow-up minus baseline)

−5.8

−4.8

0.30

HMC regression sample (n=371)

   

  Baseline

12.0

13.1

0.39

  Follow-up

4.8

6.9

0.02

  Change (follow-up minus baseline)

−7.2

−6.2

0.40

Binge alcohol days

   

Statewide regression sample (n=468)

   

  Baseline

6.6

6.2

0.63

  Follow-up

2.0

1.9

0.86

  Change (follow-up minus baseline)

−4.7

−4.3

0.73

HMC regression sample (n=371)

   

  Baseline

9.2

7.9

0.23

  Follow-up

2.1

3.3

0.04

  Change (follow-up minus baseline)

−7.2

−4.6

0.03

Illegal drug days

   

Statewide regression sample (n=631)

   

  Baseline

8.0

7.8

0.87

  Follow-up

4.4

4.5

0.95

  Change (follow-up minus baseline)

−3.5

−3.3

0.83

HMC regression sample (n=406)

   

  Baseline

8.8

10.9

0.06

  Follow-up

5.1

6.5

0.16

  Change (follow-up minus baseline)

−3.7

−4.4

0.56

  1. *P-value for two-sample t-test.