Study: NCT04025151

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Alcohol brief intervention
Description: At baseline, subjects will receive face-to-face or online alcohol brief intervention developed based on the guideline by the World Health Organisation in 5-10 minutes

Intervention type: BEHAVIORAL
Group type: ACTIVE_COMPARATOR
Intervention: Alcohol brief intervention
Description: At baseline, subjects will receive face-to-face or online alcohol brief intervention developed based on the guideline by the World Health Organisation in 5-10 minutes

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: 12-page health warning leaflet
Description: Nurses will provide information about the consequences of drinking using a 12-page health warning booklet. Benefits of reducing and quit drinking will be emphasized by focusing on improving their perception towards the impacts on health, social problems, risky behaviors, academic performance and financial issues.

Intervention type: BEHAVIORAL
Group type: ACTIVE_COMPARATOR
Intervention: 12-page health warning leaflet
Description: Nurses will provide information about the consequences of drinking using a 12-page health warning booklet. Benefits of reducing and quit drinking will be emphasized by focusing on improving their perception towards the impacts on health, social problems, risky behaviors, academic performance and financial issues.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Regular messages through Instant Messaging (IM)
Description: A total of 26 e-messages will be scheduled: once daily for the first week, 3 time/week for subsequent 4 weeks and 1 time/week for the remaining 7 weeks. The frequency will be adjusted according to IM Apps conversation and subject's requests.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: Real-time chat-based support through IM Apps
Description: The chat-based IM support is the extension of baseline ABI and regular e-messages, which aims to provide real-time behavioral and psychosocial support to reduce or quit drinking. It will be personalized according to the subjects' characteristics (gender, drinking pattern and alcoholic drinks preferences), intention to drink and specific questions regarding drinking. Through real-time chatting (text and/or voice), drinkers can acquire information on consequences of drinking and gain social support immediately to reduce intention to drink and alcohol consumption.

Intervention type: BEHAVIORAL
Group type: ACTIVE_COMPARATOR
Intervention: General health through SMS
Description: After baseline, they will receive regular e-message through SMS with similar frequency to Intervention group with content on general health and the reminding the importance of participating in the follow-up surveys.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: AUDIT score interpretation sheet adapted from the Department of Health of Hong Kong
Description: a diagram explaining drinking behaviour and potential health risks, definitions of alcohol unit and binge drinking, and advise on limiting daily drinking to 2 alcohol units for men and 1 unit for women

Intervention type: BEHAVIORAL
Group type: ACTIVE_COMPARATOR
Intervention: AUDIT score interpretation sheet adapted from the Department of Health of Hong Kong
Description: a diagram explaining drinking behaviour and potential health risks, definitions of alcohol unit and binge drinking, and advise on limiting daily drinking to 2 alcohol units for men and 1 unit for women