Drug	Dose (mg)	Number of		Per cent with outcome		Risk ratio (95% CI)
		Studies	Participants	Active	Placebo
Ibuprofen + caffeine	100+100	2	201	14	8	1.9 (0.8 to 4.1)
Ibuprofen + caffeine	200+100	4	336	11	6	2.2 (1.03 to 4.9)
Ibuprofen + paracetamol	200+500	3	508	30	48	0.7 (0.6 to 0.9)
Ibuprofen + paracetamol	400+1000	3	543	29	48	0.6 (0.5 to 0.8)
Note that statistically significant results in risk ratio are in BOLD