Lasting Effects of Workplace Strength Training for Neck/Shoulder/Arm Pain among Laboratory Technicians: Natural Experiment with 3-Year Follow-Up
Figure 2
Pain among all participants from the two companies. Overall, the positive effects obtained after the first year were maintained at 3-year follow-up, except a tendency for neck pain increment in the public sector company. There was a main effect of time () in all four regions during the controlled study (i.e., pain decreased), but not significantly during the natural experiment (i.e., the pain reduction was maintained). However, there was a borderline significant company by time interaction for neck pain, with a tendency for a worsening in the public sector company compared with the private sector company. *denotes a borderline significant company by time interaction for neck pain () during the natural experiment.
