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Early intervention in low back disability among coal miners in West Virginia: negative findings
Greenwood JG, Wolf HJ, Pearson RJ, Woon CL, Posey P, Main CF
Journal of Occupational Medicine 1990 Oct;32(10):1047-1052
clinical trial
3/10 [Eligibility criteria: No; Random allocation: Yes; Concealed allocation: No; Baseline comparability: No; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: No; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

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