Table 2.

Risk of Spontaneous Abortion among v-safe Pregnancy Registry Participants, December 14, 2020—July 19, 2021

Gestational Age	Number at risk	Self-reported SAB*	Week-specific SAB* risk (%)	Cumulative SAB risk (%, 95% CI¶)
6.0	904	15	1.66	1.66 (0.83–2.48)
7.0	982	18	1.83	3.46 (2.30–4.61)
8.0	1032	37	3.59	6.92 (5.36–8.46)
9.0	1087	39	3.59	10.26 (8.44–12.04)
10.0	1118	19	1.70	11.79 (9.87–13.66)
11.0	1184	12	1.01	12.68 (10.72–14.60)
12.0	1274	9	0.71	13.30 (11.31–15.24)
13.0	1394	5	0.36	13.61 (11.61–15.57)
14.0	1534	0	---	---
15.0	1632	2	0.12	13.72 (11.71–15.68)
16.0	1742	2	0.11	13.81 (11.81–15.78)
17.0	1848	2	0.11	13.91 (11.90–15.87)
18.0	1941	3	0.15	14.04 (12.03–16.01)
19.0	2052	2	0.10	14.12 (12.11–16.09)

^*Spontaneous abortion

^¶Confidence interval