Table 1.

Descriptive characteristics of myocarditis and pericarditis events after mRNA-1273 and BNT162b2 vaccination among people aged 18–64 years in four health plan claims databases

		DP1		DP2		DP3		DP4
		n	%	n	%	n	%	n	%
Total myocarditis or pericarditis events		154	100%	64	100%	94	100%	99	100%
Age (years)
	18–25	64	42%	21	33%	34	36%	34	34%
	26–35	15	10%	10	16%	16	17%	21	21%
	36–45	24	16%	11	17%	14	15%	14	14%
	46–55	26	17%	9	14%	13	14%	14	14%
	56–64	25	16%	13	20%	17	18%	16	16%
Sex
	Female	43	28%	27	42%	25	27%	32	32%
	Male	111	72%	37	58%	69	73%	67	68%
Type of area*
	Urban	NA	NA	60	94%	80	85%	94	95%
	Rural	NA	NA	4	6%	14	15%	5	5%
Previous COVID-19 diagnosis since April 1, 2020†		15	10%	8	13%	6	6%	10	10%

Percentages might not add up to 100% due to rounding. DP=data partner. NA=not available.

^*Urban versus rural status was defined on the basis of five-digit zip codes for enrolled members' physical addresses. This information was not available in the DP1 database.

^†A previous COVID-19 diagnosis was identified via the International Classification of Diseases (tenth revision, clinical modification) code U07.1.