Comparison 20. Non‐steroidal anti‐inflammatory drugs (NSAIDs) versus placebo.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Venous thromboembolism	1		Risk Ratio (M‐H, Fixed, 95% CI)	Totals not selected
2 Extension or recurrence (or both) of superficial thrombophlebitis	1		Risk Ratio (M‐H, Fixed, 95% CI)	Totals not selected
3 Major bleeding	1		Risk Ratio (M‐H, Fixed, 95% CI)	Totals not selected
4 Heparin‐induced thrombocytopenia	1		Risk Ratio (M‐H, Fixed, 95% CI)	Totals not selected