Table 1.
Patients’ baseline characteristics.
| Alpha Group (n = 104) |
Delta Group (n = 55) |
Omicron Group (n = 154) |
p-Value | |
|---|---|---|---|---|
| Mean age (years) | 31.5 ± 4.7 | 31.4 ± 5.1 | 31.7 ± 4.5 | 0.942 |
| Mean previous pregnancies (n) | 1.7 (1.0–2.6) | 1.6 (0.9–2.4) | 1.5 (0.8–2.3) | 0.729 |
| Mean previous miscarriages (n) | 0.3 ± 0.5 | 0.2 ± 0.4 | 0.3 ± 0.5 | 0.664 |
| Type of previous deliveries (%) | VD 74.4, CS 25.6 | VD 73.6, CS 26.4 | VD 72.2, CS 25.8 | 0.978 |
| Mean gestation period (weeks) | 38 ± 1.4 | 36 ± 1.8 | 37 ± 1.6 | <0.001 |
| Interval Diagnosis–Delivery (days) | 8.5 ± 3.2 | 8.3 ± 3.5 | 8 ± 3.1 | 0.863 |
| II trimester at delivery (%) | 2.0 | 5.8 | 2.4 | 0.049 |
| III trimester at delivery (%) | 98.0 | 94.2 | 97.6 | 0.049 |
| Type of delivery (%) | VD 38.4, CS 61.6 | VD 53.7, CS 46.3 | VD 67.5, CS 32.5 | 0.003 |
Abbreviations: %: percentage; CS: cesarean section; Interval Diagnosis–Delivery: mean interval between the diagnosis of maternal COVID-19 infection and the date of delivery; n: number; VD: vaginal delivery. Continuous variables are expressed as mean ± standard deviations (SD) and categorical variables were summarized as percentages.