“…Studies were published between 1996 and 2020. Meta-analysis of PE results included 23 studies 3 , 6 , 19 , 20 , 22 , 34 – 49 , 50 , 52 with 425,135 knee surgery patients (106,502 aspirin and 318,633 comparator) and meta-analysis of DVT included 24 studies 3 , 6 , 19 , 20 , 22 , 34 – 38 , 43 – 56 with 377,875 knee patients (90,637 aspirin and 287,238 comparator). Aspirin was compared to LMWH (11 studies), 6 , 19 , 34 , 36 , 42 , 44 , 48 , 50 , 53 , 55 , 56 factor Xa inhibitors (10 studies), 35 , 36 , 38 , 41 , 45 , 48 – 51 , 56 warfarin (10 studies) 3 , 36 , 37 , 39 , 40 , 42 , 43 , 46 , 50 , 54 and...…”