In our survey, employment period was a significant factor in LBP with higher prevalence for persons with 5 years or more experience. Seniority of workers was associated with LBP; this association was in conformance with the existing literature (Lallahom et al., 1990; Troussier et al., 1993; Valat et al., 2000). Bejia et al. (2005) found the prevalence of LBP in workers with a seniority of less than 5 years and more than 15 years to be 15.3% and 42.3%, respectively. In the current study, the prevalence of LBP in workers having less than 5 years experience and 5 years or more experience were 65.1% and 74.4%, respectively. There are two possible explanations for these findings. First, LBP in the Bejia et al. study was defined as having pain in the lower part of the back with symptoms lasting for at least 3 months, whereas the definition of LBP in the present study was reporting pain in the area between the 12th rib and gluteal folds with symptoms persisting at least 24 hours within the past 7 days. Second, the respondents in the Bejia et al. study were hospital staff, who generally may have a lower rate of LBP and disability than do industrial manufacturing workers. In the present study, we surveyed textile fish net manufacturing workers subjected to high physical workloads on a regular basis.