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Meta analysis on the relative risk of VTEs in placebo-controlled trials evaluating enoxaparin or dalteparin in THR patients. The pooled VTE relative risk was significantly different between pharmacotherapy (dalteparin or enoxaparin) vs. placebo; p < 0.001. Test for heterogeneity: Chi2 = 13.9, df = 10, p = 0.18, I2 = 28.1%
