SAN FRANCISCO - Back in July, The New England Journal of Medicine published a special article that discounted the efficacy of "back school" as a form of primary prevention of back injuries. Although the program involving about 4,000 postal workers in the Boston area was run by a team of experienced physical therapists, the evaluators found no long-term benefits associated with training. PTs had trained 2,534 postal workers and 134 supervisors. Over 5-1/2 years of follow-up, including reinforcement session
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