Background. Globally, alcohol consumption is the major cause of mortality and disease. Future health and life quality may also be affected by early initiation of alcohol consumption. It is a cross-sectional design for a research survey. Objective. This study aimed to investigate alcohol drinking behavior, the effects of alcohol consumption, and factors linked to alcohol drinking behavior among 410 secondary school students in grades 1-3 in the province of Nakhon Si Thammarat in southern Thailand. Material and Methods. A simple sample was selected from a stratified random sample of 210 individuals. The data collection instrument was a questionnaire comprised of five sections and 78 items in total. The index of item objective congruence (IO...