Table 1.

Sample characteristics overall and by vaccine manufacturer

Sample Characteristics	Full Cohort (n=48, 100%)	BNT162b2 (n=27, 56%)	mRNA-1237 (n=21, 44%)
Maternal characteristics
Maternal age, years
Median (min, max)	35 (27, 46)	35 (30, 45)	35 (27, 46)
Race/ethnicity, % (n)
Asian	31% (15)	30% (8)	33% (7)
Black or African American	2% (1)	4% (1)	0% (0)
White/Caucasian	59% (28)	55% (15)	62% (13)
Other(Arab)	2% (1)	0% (0)	5% (1)
More than 1 race/ethnicity (White+Latina/Asian/Middle Eastern)	6% (3)	11% (3)	0% (0)
Highest level of education completed
Some college	2% (1)	0% (0)	5% (1)
College graduate	17% (8)	19% (5)	14% (3)
Advanced degree	81% (39)	81% (22)	81% (17)
Work in health care?
Yes, providing direct patient care	58% (28)	52% (14)	67% (14)
Yes, but not in direct patient care	19% (9)	15% (4)	24% (5)
No	23% (11)	33% (9)	9% (2)
Pre-Pregnancy Body Mass Index
Median (min, max)	23.4 (19.1, 37.5)	23.4 (19.1, 35.9)	22.8 (19.6, 37.5)
Number of children
1	40% (19)	41% (11)	38% (8)
2	46% (22)	41% (11)	52% (11)
3	12% (6)	15% (4)	10% (2)
4	2% (1)	3% (1)	0% (0)
Duration of most recent pregnancy, weeks
Median (min, max)	39.0 (33.9, 41.1)	39.1 (33.9, 41.0)	39.0 (37.4, 41.1)
Infant characteristics
Infant age at maternal 1st dose, months
Median (min, max)	4.7 (0.1, 17.2)	4.8 (0.2, 15.2)	4.6 (0.1, 17.2)
Sex, % (n)
Male	60% (29)	67% (18)	52% (11)
Female	40% (19)	33% (9)	48% (10)
Exclusively breastfeeding (and no solids)
Yes	23% (11)	22% (6)	24% (5)
No	77% (37)	78% (21)	76% (16)
Days after vaccine that symptoms were assessed
Dose 1
Mean (SD)	78.7 (31.8)	78.3 (35.4)	79.2 (27.4)
Median (min, max)	81 (18, 154]	78 (18, 154)	86 (26, 117)
Dose 2
Mean (SD)	59.6 (25.1)	62.6 (28.3)	55.8 (20.2)
Median (min, max)	58.5 (28, 133)	57 (29, 133)	60 (28, 89)

Note: None of the characteristics above differed significantly by vaccine manufacturer.

Abbreviations: Standard deviation (SD), minimum (min), maximum (max)