TABLE 2.

Database characteristics and vaccination counts during the vaccination study period

Characteristic	CCAE	MDCD	MDCR	Optum EHR
Total Number of Subjects	156,628,301	31,355,646	10,180,158	97,936,862
Fraction female	51.10%	56.20%	55.30%	53.60%
Fraction male	48.90%	43.80%	44.70%	46.40%
H1N1pdm vaccinations	753,592	206,865	12,913	156,974
Seasonal flu vaccinations (Fluvirin)	119,242	15,288	822	14,829
Seasonal flu vaccinations (Fluzone)	957	3,358	34,414	355,593
Seasonal flu vaccinations (All)	3,517,021	1,237,934	264,636	2,617,230
1st HPV vaccinations (Gardasil 9)	376,795	237,008	8	244,664
2nd HPV vaccinations (Gardasil 9)	49,543	15,156	0	29,579
1st Zoster vaccinations (Shingrix)	148,541	11,431	52,877	221,938
2nd Zoster vaccinations (Shingrix)	72,518	5,405	30,364	64,187