Table 1.

IRR of acute myocardial infarction following COVID-19 in the SCCS

	Number of events	IRR (95% CI)	p value
Acute myocardial infarction analysis 1 (day 0 out of the risk period)
Control period	90	1 (ref)	..
Buffer period: days −28 to −4	30	2·04 (1·30–3·21)	0·0021
Pre-exposure period: days −3 to 0	30	16·20 (10·24–25·63)	<0·0001
Risk period: days 1 to 7	12	2·89 (1·51–5·55)	0·0014
Risk period: days 8 to 14	12	2·53 (1·29–4·94)	0·0067
Risk period: days 15 to 28	12	1·60 (0·84–3·04)	0·16
Acute myocardial infarction analysis 2 (day 0 in the risk period)
Control period	90	1 (ref)	..
Buffer period: days −28 to −4	30	2·06 (1·31–3·24)	0·0017
Pre-exposure period: days −3 to −1	3	2·52 (0·78–8·09)	0·12
Risk period: days 0 to 7	39	8·44 (5·45–13·08)	<0·0001
Risk period: days 8 to 14	12	2·56 (1·31–5·01)	0·0059
Risk period: days 15 to 28	12	1·62 (0·85–3·09)	0·14

IRR=incidence rate ratio. SCCS=self-controlled case series.