PREPIC, 1998 | caval filter vs no filter | pulmonary embolims (symptomatic and asymptomatic) 0.22 [0.05; 0.93] | | death 1.00 [0.29; 3.40] major bleeding 1.50 [0.54; 4.14] asymptomatic pulmonary embolism 0.00 [0.00; NaN] symptomatic pulmonary embolism 0.40 [0.08; 2.04] |