Table 2. End of pregnancy episode date accuracy: Reviewer chosen date categorized by difference from algorithm derived date.

Data Source	Outcome	< -14 days N(%)	-8 thru -14 days N(%)	-1 thru -7 days N(%)	0 days N(%)	1 thru 7 days N(%)	8 thru 14 days N(%)	> 14 days N(%)
CPRD	All Outcomes	4 (0.6)	6 (0.9)	2 (0.3)	674 (96.8)	10 (1.4)	0	0
	Live Birth	2 (0.7)	0	0	286 (98.6)	2 (0.7)	0	0
	Ectopic	0	2 (2)	2 (2)	90 (90)	6 (6)	0	0
	Abortion	2 (1)	2 (1)	0	202 (98.1)	0	0	0
	Stillbirth	0	2 (2)	0	96 (96)	2 (2)	0	0
Optum	All Outcomes	4 (0.6)	6 (0.9)	4 (0.6)	678 (97.1)	0	2 (0.3)	4 (0.6)
	Live Birth	0	0	0	286 (99.3)	0	0	2 (0.7)
	Ectopic	2 (2)	0	2 (2)	94 (95.9)	0	0	0
	Abortion	2 (1)	6 (2.9)	0	198 (94.3)	0	2 (1)	2 (1)
	Stillbirth	0	0	2 (2)	100 (98)	0	0	0