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Table 1 Relationship of four-week follow-up drinking with intervention condition and level of action for change intent after controlling for baseline drinking

From: Exploratory randomized controlled trial evaluating the impact of a waiting list control design

 

Drinks per week

Highest number

AUDIT-Ca

Predictor

∆R2

β (95% C.I)

∆R2

β (95% C.I)

∆R2

β (95% C.I)

STEP 1

.32***

 

.45***

 

.19***

 

Baseline drinking

 

0.46 (0.35 - 0.56)***

 

0.50 (0.41 - 0.59)***

 

0.59 (0.39 - 0.79)***

STEP 2

.05**

 

.01

 

.06**

 

Conditionb

 

1.51 (-2.71 – 5.73)

 

0.45 (-0.84 – 1.74)

 

0.27 (-0.50 – 1.03)

Action subscale

 

-0.87 (-1.41 - -0.32)**

 

-0.12 (-0.29 – 0.44)

 

-1.65 (-0.26 - -0.06)***

STEP 3

.02*

 

.03**

 

.01

 

Condition*Action

 

1.08 (0.00 - 2.16)*

 

0.48 (0.16 - 0.81)**

 

0.14 (-0.06 – 0.34)

  1. Note: *p ≤ .05. **p ≤ .01. ***p ≤ .001.
  2. aAUDIT-C is a composite measure that consists of respondents scores on frequency of drinking, drinks per drinking day, and frequency of five or more drinks on one occasion.
  3. bCondition: 0 = told in intervention condition; 1 = told in waiting list condition.
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BMC Medical Research Methodology

ISSN: 1471-2288

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