6. Network meta‐analysis, by generation of progestogen used in combined oral contraceptives.

	Reference group
	Non‐use	1st	2nd	3rd
Non‐use	1	‐	‐	‐
1st	3.2 (2.0‐5.1)	1	‐	‐
2nd	2.8 (2.0‐4.1)	0.9 (0.6‐1.4)	1	‐
3rd	3.8 (2.7‐5.4)	1.2 (0.8‐1.9)	1.3 (1.0‐1.8)	1
Data are in relative risk (95% CI) of venous thrombosis