I have one group of alcohol users and have to see the effectiveness of my interventions on their alcohol use (quit or not quit). I apply Pre-post quasi experiment while repeated (at least 2) followups in post interventional phase.
Alcohol use interventions need to be sensitive to pick up change as people usually reduce use gradually with episodes of increased use. so your timescale would need to be quite long (at least 6 months) to detect lasting improvement and any measure would need to pick up on general trend of use over time. There are useful tools such as AUDIT and the SADQ which measure use but are self-report. alternatively, a bio-chemical test of gamma GT is a good indicator of alcohol use over time. If you want to separate the outcomes into quit/no quit, you will have to decide what rate of change would be indicative of change. This might differ between individuals but a large sample size would soak this up.
An alternative would be to measure intention to quit. There is the Drinking Refusal Self-Efficacy Questionnaire (DRSEQ) which is useful for tracking change in motivation and confidence to change. This is quite sensitive but long.
You can use repeated measures of t-test to check the significant difference between multiple conditions of the same group.
Although, since it is not an experimental design the result will not confirm the efficacy/ effectiveness of the intervention even if there are statistically significant differences. If you can include a control group, and if both the experimental and control group has baseline homogeneity, it is possible to test the efficacy of the intervention with comparison between both groups.
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