Few studies have reported prevalence of supraspinatus tendinitis on a population basis, yet these problems are often the second most costly in many worker compensation systems. We report the prevalence of glenohumeral joint pain and supraspinatus tendinitis and identify non-occupational risk factors. An occupational cohort of 683 workers performing diverse work tasks from multiple industries in 2 states underwent questionnaires, structured interviews and physical examinations. The workers are 66.1 % female, with a mean age of 40.7 + 11.3 years and mean Body Mass Index (BMl) of 28.5 + 6.4 kg/m2. The 1-month prevalence of glenohumeral shoulder joint pain on the right and left was 36.1% and 29.1 % respectively. Supraspinatus tendinitis was defined as glenohumeral joint pain and a positive supraspinatus test. Prevalence of supraspinatus tendinitis was 7.3% on the right and 8.5% on the left. Logistic regression results for right glenohumeral joint pain showed age [Odds Ratio (OR) = 1.03 (95% Confidence Interval (CI) 1.01, 1.04)] and BMI (OR = 1.03,95% CI = 1.01, 1.06) to be statistically associated. Tobacco was borderline associated (p = 0.14). Results for the left shoulder were similar, but not statistically significant. Logistic regression results for right supraspinatus tendinitis showed age 10 be associated (OR = 1.03,95% CI = 1.01, 1.06)], while tobacco was borderline (p = 0.10) and BMI was not (p = 0.29). Results were not statistically significant on the left. Glenohumeral joint pain and supraspinatus tendinitis appear common. Non-occupational risk factors appear to include age and possibly BMI and tobacco.
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