Table 1.

Patients’ characteristics (IQR = interquartile range).

Characteristics	Value
Number of patients (n)	160
Age (years), median (IQR)	32 (28)
Positive molecular swabs, n (%)	15 (9)
At least one positive molecular swab or serological test, n (%)	23 (14)
Cardioaspirin administration, n (%)	4 (3)
Administration of low-molecular-weight heparin, n (%)	2 (1)
Amniocentesis, n (%)	5 (3)
Malformations, n (%)	3 (2)
Abortions, n (%)	2 (1)
Preterm birth, n (%)	15 (11)
Alpha-fetoprotein (ng/mL), median (IQR)	1 (0.9–1.2)
Estriol (ng/mL), median (IQR)	1 (0.9–1.3)
Human chorionic gonadotropin (mlU/mL), median (IQR)	1 (1.8–1.4)
Pregnancy-associated plasma protein A (UI/L), median (IQR)	1 (0.7–1.6)
Nuchal translucency (mm), median (IQR)	1.1 (0.9–1.2)
Vitamin D levels in first trimester (ng/mL), median (IQR)	23 (17–29)
Vitamin D levels in second trimester (ng/mL), median (IQR)	25 (19–35)
Vitamin D levels in third trimester (ng/mL), median (IQR)	30 (23–39)