Abstract. [Purpose] The aim of this study was to investigate the prevalence of low back pain and associated
factors in Thai rice farmers during the rice transplanting process. [Subjects and Methods] Three hundred and fortyfour
farmers, aged 20–59 years old, were asked to answer a questionnaire modified from the Standard Nordic Questionnaire
(Thai version). The questionnaire sought demographic, back-related, and psychosocial data. [Results] The
results showed that the prevalence of low back pain was 83.1%. Farmers younger than 45 years old who worked in
the field fewer than six days were more likely to experience low back pain than those who worked for at least six
days. Farmers with high stress levels were more likely to have low back pain. [Conclusion] In the rice transplanting
process, the low back pain experienced by the farmers was associated with the weekly work duration and stress.
Key words: Low back pain, Rice farmers, Rice transplanting process