SAN FRANCISCO - Researchers at the University of Iowa sent surveys to 7,000 construction workers through their local unions, asking how often in the past year they missed work because of a back problem or shoulder pain.Some 2,078 surveys were returned. Respondents averaged about 19 years at a trade. Almost 72% of them said they had job-related lower back problems in the past year. Nearly half of them reported problems with their knees, wrists/hands, shoulders or neck. Almost 1/3 of them sought medical
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