Alcohol problems have increased considerably in Thailand in recent years, i
n common with many other countries in South East Asia. Little is known abou
t the patterns or contexts of alcohol consumption in these countries, and s
o efforts to develop preventative strategies have been hampered. To identif
y current patterns related to alcohol consumption, we recruited 91 alcohol-
dependent subjects, 77 hazardous or harmful drinkers, and 144 abstainers or
light drinkers. A structured interview incorporating the World Health Orga
nization 'tri-level' method to determine the amount and frequency of drinki
ng, and the Alcohol Use Disorders and Associated Disabilities to diagnose a
lcohol dependence and harmful drinking was used. Median alcohol intake was
75 and 49 g/drinking day in the alcohol-dependent and harmful or hazardous
groups respectively. The former group drank on average 25 days/month, where
as the harmful or hazardous drinkers drank 10 days/month. Drinking alone wa
s more Common in the alcohol-dependent group (67%), whereas harmful or haza
rdous drinkers typically drank with friends (58%), and infrequent drinkers
drank only at social functions (61%). Only 28% of alcohol-dependent subject
s perceived themselves as dependent on alcohol. The alcohol-dependent subje
cts and hazardous or harmful drinkers were more likely to currently smoke c
igarettes and have a history of marijuana use than were non-drinkers, infre
quent or light drinkers. Antisocial personality disorder was more commonly
associated with alcohol dependence. In conclusion, alcohol dependence was c
haracterized by continual drinking, whereas hazardous or harmful consumptio
n was associated with an intermittent pattern. Other forms of substance use
and personality disorder were associated with alcohol dependence. Clearer
understanding of these factors would be of great benefit in planning an int
ervention programme for excessive drinking in Thailand.