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Objectives: To investigate the effectiveness of a telephone-based acceptance and commitment therapy (ACT) in assisting young adult drinkers with hazardous or harmful alcohol use (HH drinkers) to quit drinking.
Hypothesis to be tested:
Primary hypothesis: 1) those who receive telephone-based ACT will report a significantly higher biochemical validated abstinence than the control groups.
Secondary hypotheses are that compared with the control groups, those who receive telephone-based ACT will show: 2) significantly higher self-reported 30-day abstinence, 3) significantly greater reduction in drinking, and 4) significantly higher psychological flexibility.
Design and subjects: A Hong Kong randomized controlled trial with 2-arm waitlist controlled trial design on 288 individuals (aged 18-35 years, able to read Chinese and speak Cantonese, and with AUDIT scores≥8).
Study instruments: Biochemical-validated abstinence (Urine strips), timeline Follow-Back questionnaire, self-reported 30-day abstinence and Personalized Psychological Flexibility Index, Short-Form 6 Dimensions and semi-structured interviews.
Interventions:
The intervention group(n=144) will receive 6-weekly telephone-based ACT. The waitlist control group (n=144) will receive 6-weekly telephone-based social support intervention.
Main outcome measures: Primary outcome is biochemical-validated abstinence at the 6-month follow-up. Secondary outcomes include self-reported 30-day abstinence alcohol reduction, and psychological flexibility at baseline, post-program, 1-, 3-, and 6-month follow-ups.
Data analysis: Descriptive statistics, generalized estimating equations, multiple imputation, intention-to-treat, per protocol analyses, and cost-effectiveness analysis.
Expected results: The telephone-based ACT is effective in assisting HH drinkers to quit drinking.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Telephone-based ACT | Experimental | Telephone-based ACT for alcohol abstinence |
|
| Waitlist control | Placebo Comparator | Telephone-based social support |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Telephone-based ACT | Behavioral | Each participant will join a six-session weekly telephone-based ACT programme conducted by the interventionists. Each session will last approximately 45-60 minutes. |
| Measure | Description | Time Frame |
|---|---|---|
| biochemically-validated abstinence | The urine strips will be used for testing the content of ethyl glucuronide(a by-product of alcohol). Participants who self-report quitting drinking within the past 30 days at the 6-month follow-up will be invited to do the test. | at the 6-month follow-up |
| Measure | Description | Time Frame |
|---|---|---|
| self-reported 30-day alcohol abstinence | at post-programme(T1) and at the 1-month(T2), 3-month(T3) and 6-month(T4) follow-ups | |
| self-reported 30-day reduction in alcohol consumption | reduction in alcohol consumption refer to: 50% or more reduction in average alcohol consumption per day when compared with baseline at T0 |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Ka Wai Katherine LAM, Doctor of Philosophy | Contact | +852 27666420 | kw-katherine.lam@polyu.edu.hk |
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| ID | Term |
|---|---|
| D064829 | Alcohol Abstinence |
| ID | Term |
|---|---|
| D004327 | Drinking Behavior |
| D001519 | Behavior |
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| Telephone-based social support | Behavioral | Participants will receive weekly 45-minute telephone-based social support from an interventionist(not involved in the intervention group) for 6 weeks, which mimics the time and attention received by those in the intervention group. |
|
| at post-programme(T1) and at the 1-month(T2), 3-month(T3) and 6-month(T4) follow-ups |
| psychological flexibility | Personalised Psychological Flexibility Index(PPFI) will be used to measure psychological flexibility by 19 items rating on a 7-point scale. Higher scores represent greater psychological flexibility. It has been validated among Chinese college students. | at post-programme(T1) and at the 1-month(T2), 3-month(T3) and 6-month(T4) follow-ups |