Table 2.

Venous thromboembolic events for second dose ChAdOx1 vaccine.

Time-period post vaccination	Number of events	Number of person days	Incidence rate ratio (95% confidence interval)
Venous thromboembolic events (VTE)
Baseline	11,381	5,566,675	1.0
Clearance	391	186,900	0.82 (0.73–0.91)
0–6 days	148	93,430	0.61 (0.52–0.72)
7–13 days	269	93,317	1.11 (0.98–1.27)
14–20 days	213	92,994	0.88 (0.77–1.0)
21–27 days	250	92,525	1.0 (0.91–1.18)
0–27 days	880	372,266	0.91 (0.84–0.98)
Cerebral venous sinus thrombosis (CVST)
Baseline	102	55,344	1.0
Clearance	0	1316	0.0 (NA)
0–6 days	≤5	658	0.73 (0.09–5.41)
7–13 days	≤5	658	2.79 (0.94–8.17)
14–20 days	≤5	652	1.36 (0.31–5.80)
21–27 days	≤5	644	2.0 (0.60–6.73)
0–27 days	10	2612	1.73 (0.82–3.68)
Pulmonary embolism (PE)
Baseline	5668	2,694,185	1.0
Clearance	172	91,014	0.72 (0.61–0.84)
0–6 days	74	45,489	0.62 (0.49–0.78)
7–13 days	126	45,418	1.1 (0.89–1.28)
14–20 days	101	45,254	0.86 (0.71–1.1)
21–27 days	106	44,954	0.92 (0.75–1.12)
0–27 days	407	181,115	0.87 (0.77–0.97)
Deep vein thrombosis (DVT)
Baseline	5729	2,882,244	1.0
Clearance	219	96,236	0.90 (0.78–1.0)
0–6 days	75	48,116	0.61 (0.48–0.77)
7–13 days	146	48,084	1.17 (0.98–1.39)
14–20 days	110	47,922	0.88 (0.72–1.1)
21–27 days	141	47,764	1.12 (0.94–1.34)
0–27 days	472	191,886	0.94 (0.85–1.1)