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Background: The most common type of Muscular-skeletal Disorders (MSD) among health care worker is Low Back Pain (LBP). This study aimed to investigate the effects of an educational program based on the Social Cognitive Theory (SCT) on low back pain severity in healthcare workers in hospitals located in Qom, Iran.

Materials and Method: In this interventional research study, 125 nursing aides were divided into two experimental and control groups. Data gathering instruments were a demographic questionnaire and a questionnaire based on the predictor constructs of SCT. For the intervention group, training was administered by health education specialist in four 2-hour sessions In each session discussion regarding selfefficacy, self-control, outcome reinforcement, and emotional coping were taken into account carefully, respectively. Data were analyzed SPSS version 18.0, IBM company. Result: There were significant differences between the two groups regardless of time, between different periods of time regardless of the groups, and between time and group (P≤. 0001). During the time period, the intervention group had better conditions in all LBP predictors comparing to the control group.