Table 4.

Fitted parameters for the survival function S(t) for a Weibull distribution (λ, k) for complete and incomplete dose, with at least 100 observations.

Vaccine	Complete dose				Incomplete dose
	N 1	λ1	k 1	${\mu }_1^{*}$	N 0	λ0	k 0	${\mu }_0^{*}$	μ1/μ0†	${\mu }_1/{\mu }_{AI}^{‡}$
AZ	7,506	205.6	2.9	183.4	4,688	65.6	1.3	60.2	3	2.3
CA	1,997	166	2	147.1	–	–	–	–	–	1.9
MO	135	217	3.6	195.6	41	–	–	–	–	2.5
SP	140	191	2.7	169.9	43	–	–	–	–	2.1
SV	3,409	184.9	2.5	164.1	960	70.1	1.2	66.7	2.5	2.1
GA	1,005	206.2	2.9	183.8	328	77.5	1.2	72.4	2.5	2.3
JA	1,566	178.6	3	159.4	–	–	–	–	–	2
PF	7,338	235.3	2.7	209.2	1,220	92	1.1	88.6	2.4	2.6
AI	147	87.3	1.4	79.4	–	–	–	–	–	1

The data used was elapsed time from first dose. Last row contains parameters for the duration of immunity due to active infection (AI).

AI, active infection.

${}^{*}{\mu }_i=\lambda \Gamma (1+k)$, from fitted Weibull model.

^†μ₁/μ₀, the ratio complete vs. incomplete dose average protection time.

${}^{‡}{\mu }_1/{\mu }_0$, the ratio complete vs. active infection average protection time.