Table 1.

Summary of fertility data from female rats administered control (saline) or BNT162b2.

	Control (saline)	BNT162b2
Fertility (n)a	44	44
Mean Estrous Cycle Length (days)b, c	4.02 ± 0.19	4.00 ± 0.11
Females with Acyclic Periodd	8/44 (18.2 %)	8/44 (18.2 %)
Days in Cohabitationb	3.0 ± 2.2	2.8 ± 1.7
Mating (Copulation) Indexe	44/44 (100 %)	44/44 (100 %)
Fertility Indexf	43/44 (98 %)	42/44 (95 %)
Pregnancy Rateg	43/44 (98 %)	42/44 (95 %)

*p ≤ 0.05, **p ≤ 0.001, (g) = grams.

^aCombined data from both cesarean section and delivery cohorts.

^bData presented as mean per group ± standard deviation.

^cEstrous cycle length is determined by counting the days from the first day of estrous and the next cycle, and only complete cycles are counted. Estrous cycle length calculation excluded females with no complete cycles (acyclic) (n = 8 in control and BNT162b2 groups).

^dAny cycle with length > 6 days is considered an acyclic period, and females with no complete cycles were considered acyclic.

^eCalculated as number of mated females/number paired × 100.

^fCalculated as number pregnant/number paired × 100.

^gCalculated as number pregnant/number mated × 100.