Table 2a.

Number of mRNA COVID-19 vaccine doses among hospitalized adults recorded in immunization information systems (IIS) and electronic medical records (EMR) — IVY Network, February 1–August 31, 2022, N = 4499.

Number of mRNA COVID-19 vaccine doses	Frequency			Proportion by IIS* (95 % CI)	Proportion by EMR† (95 % CI)	Kappa (95 % CI)
	Both (a)	IIS only (b)	EMR only (c)
No evidence of vaccination§	1080	147	362	0.77 (0.75–0.79)	0.91 (0.89–0.92)	0.73 (0.72–0.74)
1 dose	129	92	81	0.73 (0.68–0.78)	0.70 (0.64–0.75)	0.58 (0.52–0.63)
2 doses	775	214	305	0.76 (0.74–0.79)	0.83 (0.81–0.85)	0.67 (0.66–0.69)
3 doses	1215	386	180	0.90 (0.88–0.91)	0.78 (0.76–0.80)	0.72 (0.70–0.73)
≥4 doses	326	135	46	0.91 (0.88–0.93)	0.73 (0.70–0.77)	0.76 (0.69–0.83)

Abbreviations: IIS = immunization information system; EMR = electronic medical record; CI = confidence interval.

^*Proportion detected IIS = a + b/a + b + c.

^†Proportion detected EMR = a + c/a + b + c.

^§For IIS, no evidence of vaccination includes scenarios in which the patient’s record is available in the IIS and there is no documentation of COVID-19 vaccine receipt as well as scenarios in which there is no record of patient in the IIS. For EMR, no evidence of vaccination refers only to patients without documented COVID-19 vaccine doses since all hospitalized patients have a medical record.