Table 7.

Reported arterial thromboembolic and hemorrhagic events for second dose ChAdOx1 vaccine

Time-period post vaccination	Number of events	Number of person-days	Incidence rate ratio (95% confidence intervals)
Arterial thromboembolic events
Baselinea	13,895	4,747,305	1.00
Clearanceb	723	259,878	0.79 (0.73–0.86)
0–6 days	372	130,467	0.81 (0.73–0.90)
7–13 days	421	130,259	0.92 (0.83–1.02)
14–20 days	451	129,889	0.98 (0.89–1.08)
21–27 days	437	129,563	0.96 (0.87–1.05)
0–27 days	1681	520,178	0.92 (0.87–0.97)
Hemorrhagic events
Baselinea	1320	435,077	1.00
Clearanceb	64	23,973	0.71 (0.55–0.93)
0–6 days	30	12,076	0.66 (0.45–0.95)
7–13 days	40	12,034	0.88 (0.64–1.21)
14–20 days	35	11,985	0.78 (0.55–1.10)
21–27 days	45	11,923	1.02 (0.75–1.39)

^aIncludes all three baseline periods before dose 1 and before and after dose 2—see Fig. 1.

^bSecond dose clearance period NB ≤5 Denotes minimum allowable reported value.