Table 2.

Rates of return to clinic in vaccinated and unvaccinated individuals after the second vaccine dose

Vaccine	Time interval after second actual or assigned dose	Vaccinated individuals with at least one note (%)	Unvaccinated individuals with at least one note (%)	OR (95% CI)
BNT162b2 (39,058 individuals per cohort)	7 days	7,318 (18.74%)	5,342 (13.68%)	1.46 (1.4–1.51)
	14 days	10,784 (27.61%)	7,954 (20.36%)	1.49 (1.44–1.54)
	21 days	13,187 (33.76%)	9,750 (24.96%)	1.53 (1.49–1.58)
mRNA-1273 (11,851 individuals per cohort)	7 days	2,790 (23.54%)	1,828 (15.42%)	1.69 (1.58–1.8)
	14 days	4,261 (35.95%)	2,682 (22.63%)	1.92 (1.81–2.03)
	21 days	5,226 (44.1%)	3,260 (27.51%)	2.08 (1.97–2.2)

We show the numbers and percent of individuals in each group who had at least one phenotype-containing EHR note within 7, 14, or 21 days of the actual or assigned second vaccination date. To assess the magnitude and significance of difference between the follow-up rates, the OR and corresponding 95% CI are shown. With the null hypothesis that the OR falls between 0.91 and 1.1, a difference was considered significant if the upper bound of the 95% CI was less than 0.91 or the lower bound of the 95% CI was greater than 1.1.