In correlation analysis between age and BMI of workers with musculoskeletal disorders, the preva-lence of participant workers in last week and year, musculoskeletal disorders prevalence had significant association with BMI (p=0.004) and non-significant association with age (p=0.084) of works. According to career duration, our participants were divided into three groups: Less than 5 years, 5-20 years and more than 20 years. Prevalence of mus-culoskeletal disorders of last week in participants with less than five and more than 20 years career duration were significantly higher than participants
with 5-20 years career duration (p=0.003). A similar significant difference was seen in prevalence of mus-culoskeletal disorders of last year (p=0.00) (Table 4). In our logistic regression analysis after entering demographic data into the model, age and past job history remained in our model and in the other hand, other demographic factors did not have significant impact on musculoskeletal disorders (Table 5).