Abstract. Prolonged posture, static works and repetition are previously reported as the cause of repetitive strain injuries
(RSIs) among workers including teachers. This cross-sectional analytic study aimed to investigate the prevalence and risk
factors of RSIs among school teachers. Participants were 452 full-time school teachers in Thailand. Data were collected by
the structural questionnaires, illuminance measurements and the physical fitness tests. Descriptive statistics and inferential
statistics which were Chi-square test and multiple logistic regression analysis were used. Most teachers in this study were
females (57.3%), the mean years of work experience was 22.6 ± 10.4 years. The six-month prevalence of RSIs was 73.7%.
The univariate analysis identified the related risk factors to RSIs which were chronic disease (OR=1.8; 95% CI = 1.16-2.73),
history of trauma (OR=2.0; 95% CI = 1.02-4.01), member of family had RSIs (OR=2.0; 95% CI = 1.02- 4.01), stretch to
write on board (OR=1.7; 95% CI = 1.06-1.70) and high heel shoe >2 inch (OR=1.6; 95% CI = 1.03-2.51). Multiple logistic
regression analysis showed that chronic diseases and high heel shoe >2 inch significantly related to developing of RSIs. The
poor grip strength and back muscle flexibility significantly affected RSIs of teachers. In conclusions, RSIs were highly
prevalent in school teachers that they should be aware of health promotion to prevent RSIs.
Keywords: musculoskeletal disorders, ergonomics, prevalence