|
Variables
|
Status group
|
|---|
|
Low risk (LR)
|
High risk (HR)
|
|---|
|
No use
|
Light use
|
Occasional heavy use
|
Frequent heavy use
|
|---|
|
Proportion in each status
|
|
Preintervention drinking (previous 90 days)
|
0.18
|
0.13
|
0.39
|
0.30
|
|
Intentions at postintervention (for next 90 days)
|
0.31
|
0.39
|
0.21
|
0.09
|
|
Item-response probabilities
a
|
|
Usual quantityb
|
|
0
|
0.77
|
0.00
|
0.02
|
0.02
|
|
1–3
|
0.11
|
0.97
|
0.29
|
0.08
|
|
4–6
|
0.09
|
0.03
|
0.53
|
0.26
|
|
7–9
|
0.02
|
0.00
|
0.11
|
0.24
|
|
≥10
|
0.01
|
0.00
|
0.05
|
0.40
|
|
Frequency 4–6c
|
|
Never
|
1.00
|
0.73
|
0.03
|
0.10
|
|
<Once a week
|
0.00
|
0.27
|
0.70
|
0.11
|
|
≥Once a week
|
0.00
|
0.00
|
0.27
|
0.79
|
|
Frequency ≥7c
|
|
Never
|
1.00
|
1.00
|
0.30
|
0.03
|
|
<Once a week
|
0.00
|
0.00
|
0.70
|
0.13
|
|
≥Once a week
|
0.00
|
0.00
|
0.00
|
0.84
|
-
aItem-response probabilities can be thought of as the frequency distribution for each variable within that status. These were the same for both preintervention drinking and postintervention intentions (they were constrained to be equal across timepoints). We labeled each status group according to the preponderant characteristics suggested by the item-response probabilities
-
bPrior/intended usual quantity of drinks
-
cPrior/intended frequency of consuming 4–6 or ≥7 drinks
