showed a trendP = .50
Results from 30,813 patients showed that, compared with aspirin, LMWH [odd ratio (OR) = 0.47, 95%CI: 0.29, 0.83], factor Xa inhibitors (OR = 0.50, 95%CI: 0.30, 0.89), and fondaparinux (OR = 0.32, 95%CI: 0.16, 0.64) significantly reduced the risk of VTE, but warfarin showed a trend towards a decreased risk (OR = 0.59, 95%CI: 0.36, 1.04; P = .50).