Baseline demographics
Astra Zeneca
N=441
Pfizer BioNTech
N=513
p-value
Maternal age – years
30.0±4.4 30.8±4.5 <0.001
Previous pregnancies – n (%)
<0.001
0 240 (54.4) 206 (40.2)
1 92 (20.9) 158 (30.8)
2 87 (19.7) 119 (23.2)
≥ 3
22 (5.0) 30 (5.8)
Type of pregnancy – n (%)
0.009
Spontaneous 385 (87.3) 475 (92.6)
In Vitro Fertilization 56 (12.7) 38 (7.4)
Number of vaccine doses – n (%)
<0.001
Only 1 dose 176 (39.9) 99 (19.3)
2 doses 265 (60.1) 414 (80.7)
Gestational age at vaccination – weeks
31.9±4.5 32.4±4.0
0.067
High blood pressure at vaccination
0 (0.0) 3 (0.6) .
Diabetes at vaccination
58 (13.2) 62 (12.1) 0.691