Table 2. Comparison of patients on aspirin in the arthroplasty studies with the number and rates of VTE.

Study author	Dose of aspirin	Length of treatment	Number of patients on aspirin	Number of patients who suffered from symptomatic DVT	Rate of symptomatic DVT
Raphael et al, 2014 15	325 mg BD	Unknown	2,800	8	0.29%
Jiang et al, 2014 16	?	?	60	0	0.00%
Zou et al, 2014 17	100 mg/d	14 d	110	2	1.81%
Na et al, 2015 18	100 mg/d	14 d	282	0	0.00%
Pow and Vale, 2015 20	Unknown	Minimum 10–14 d	125	4	3.20%
Ogonda et al, 2016 21	150 mg OD	6 wk	11,459	37	0.32%
Yhim et al, 2017 22	Unknown	On average for 9 d	28,176	232	0.82%
Total	−	−	43,012	283	0.66%

Abbreviations: BD, twice a day; DVT, deep vein thrombosis; OD, once daily; VTE, venous thromboembolism.