12. Results of sensitivity analyses.

	Source of bias and No of studies
Generation of progestogen	Industry (n=8)	Non‐industry (n=9)	Cohort study (n=8)	Case‐control (n=15)	Objectively confirmed venous thrombosis (n=5)	Subjectively confirmed venous thrombosis (n=11)
Non‐use	1	1	1	1	1	1
1st	2.6 (0.9‐7.4)	3.3 (2.4‐4.6)	2.0 (0.4‐10.5)	3.3 (2.3‐4.7)	4.5 (3.2‐6.5)	2.6 (1.3‐5.3)
2nd	2.1 (1.0‐4.8)	3.1 (2.5‐3.8)	1.7 (0.4‐8.0)	2.9 (2.3‐3.7)	3.3 (2.8‐4.0)	2.5 (1.4‐4.5)
3rd	1.9 (0.8‐4.2)	5.2 (4.2‐6.5)	2.0 (0.5‐8.6)	4.2 (3.3‐5.3)	6.2 (5.2‐7.4)	3.0 (1.7‐5.4)
	Data are relative risk (95% confidence interval) of venous thrombosis