Drug use among agriculture-related workers in Thailand [version 1; peer review: 1 approved with reservations]

Objectives : To examine drug use prevalence and to explore the associations of cluster environment characteristics with drug use among agriculture-related workers in Thailand. Methods : This was a cross-sectional study involving 2936 agriculture-related workers from 10 clusters in 4 regions throughout Thailand. Trained interviewers conducted semi-structured interviews. Additionally, the drug-use patterns and behaviors of 124 current users were structurally observed. A multilevel binary logistic regression model was used to estimate the effects of the cluster environment on drug use. Results : The annual prevalence was 58.73%. Illicit drugs, non-prescription drugs, or over the counter medicines were widely used. Age, sex, and non-prescription behavior were associated with substance use that was statistically significant. Contextual clustering was found to significantly affect drug use among agriculture-related workers. A 1-unit increase in treatment rate predicted 12.7-times higher illicit drug use and 15.3-times higher methamphetamine use. Conclusions : Agricultural work facilitated the spread of drug use The design of the surveillance system should be considered.