Table 1. Demographic and clinical features of the individuals with a hospital admission in SUS or an emergency care consultation in the ECDS dataset for myocarditis and pericarditis: data from entire eligible population in England.

		person years	SUS pericarditis case count = 1,651*	SUS pericarditis risk per 100,000	SUS myocarditis case count = 2,284*	SUS myocarditis risk per 100,000	ECDS pericarditis case count = 6,461	ECDS pericarditis risk per 100,000	ECDS myocarditis case count = 1,472	ECDS myocarditis risk per 100,000
Age group	12 to 15	2,742,347	8	0.29	28	1.02	111	4.05	42	1.53
	16 to 17	1,305,334	30	2.30	73	5.59	151	11.57	71	5.44
	18 to 19	1,296,676	54	4.16	119	9.18	241	18.59	118	9.10
	20 to 24	3,730,389	119	3.19	233	6.25	757	20.29	241	6.46
	25 to 29	4,196,722	117	2.79	199	4.74	754	17.97	184	4.38
	30 to 34	4,513,956	127	2.81	200	4.43	715	15.84	163	3.61
	35 to 39	4,297,665	106	2.47	166	3.86	705	16.40	144	3.35
	40 to 44	3,956,356	126	3.18	153	3.87	565	14.28	91	2.30
	45 to 49	3,768,292	131	3.48	155	4.11	517	13.72	84	2.23
	50 to 54	4,013,470	140	3.49	157	3.91	486	12.11	61	1.52
	55 to 59	3,903,178	139	3.56	166	4.25	431	11.04	74	1.90
	60 to 64	3,320,364	124	3.73	145	4.37	293	8.82	57	1.72
	65 to 69	2,773,874	111	4.00	113	4.07	242	8.72	45	1.62
	70 to 74	2,732,488	125	4.57	122	4.46	191	6.99	36	1.32
	75 to 79	2,069,915	82	3.96	101	4.88	146	7.05	31	1.50
	80 to 84	1,390,802	61	4.39	91	6.54	83	5.97	17	1.22
	85 to 89	868,675	39	4.49	44	5.07	55	6.33	10	1.15
	90+	504,934	12	2.38	19	3.76	18	3.56	3	0.59
Sex	Male	25,717,812	1,132	4.40	1,456	5.66	4,634	18.02	1,001	3.89
	Female	25,667,624	519	2.02	828	3.23	1,827	7.12	471	1.83
Region	East of England	5,910,664	175	2.96	335	5.67	703	11.89	165	2.79
	London	8,807,901	249	2.83	420	4.77	973	11.05	239	2.71
	Midlands	9,496,410	220	2.32	321	3.38	986	10.38	248	2.61
	North East and Yorkshire	7,641,777	217	2.84	273	3.57	938	12.27	186	2.43
	North West	6,393,140	215	3.36	278	4.35	713	11.15	199	3.11
	South East	8,025,838	365	4.55	445	5.54	1,230	15.33	267	3.33
	South West	5,109,705	210	4.11	212	4.15	859	16.81	153	2.99
Ethnicity	Asian	4,398,660	94	2.14	155	3.52	513	11.66	103	2.34
	Black, African, Caribbean	1,756,382	108	6.15	133	7.57	468	26.65	95	5.41
	Mixed, Multiple	820,496	22	2.68	45	5.48	145	17.67	38	4.63
	NK	6,752,624	95	1.41	182	2.70	448	6.63	101	1.50
	Other	1,173,462	42	3.58	69	5.88	165	14.06	48	4.09
	White	36,483,810	1,290	3.54	1,700	4.66	4,722	12.94	1,087	2.98
Clinically vulnerable	No	47,787,906	1,387	2.90	1,943	4.07	5,830	12.20	1,333	2.79
	Yes	3,597,530	264	7.34	341	9.48	631	17.54	139	3.86
In an “at risk” group	No	43,400,928	1,107	2.55	1,446	3.33	4,545	10.47	1,010	2.33
	Yes	7,984,508	544	6.81	838	10.50	1,916	24.00	462	5.79
Unvaccinated		16,751,085	206	1.23	340	2.03	1,036	6.18	225	1.34
Primary course	ChAdOx1	18,381,521	728	3.96	859	4.67	2,332	12.69	439	2.39
	BNT162b2	15,459,412	670	4.33	972	6.29	2,833	18.33	728	4.71
	mRNA-1273	793,417	47	5.92	112	14.12	259	32.64	79	9.96

*Eleven SUS cases had a diagnosis of both myocarditis and pericarditis.

ECDS, Emergency Care Data Set; SUS, Secondary Uses Service.