Emerging adults in substance misuse intervention: preintervention characteristics and responses to a motivation-enhancing program

Table 3 Characteristics of status groups from LTA model (N = 1183)

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 quantity^b
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 4–6^c
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 ≥7^c
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

ISSN: 1940-0640