Table.
Characteristics of pregnant women with SARS-CoV-2 infection during pregnancy included in the study
| Delta-dominant period | Omicron-dominant period | ||
|---|---|---|---|
| Infections | 4955 | 4968 | |
| Trimester 1 (2+0 to 13+6 weeks of gestation) | 1579 (31·9% [30·3–33·4]) | 1869 (37·6% [36·1–39·2]) | |
| Trimester 2 (14+0 to 27+6 weeks gestation) | 1870 (37·7% [36·2–39·3]) | 1724 (34·7% [33·2–36·3]) | |
| Trimester 3 (≥28+0 weeks gestation) | 1506 (30·4% [28·9–32·0]) | 1375 (27·7% [26·1–29·2]) | |
| Age group, years | |||
| ≤19 | 224 (4·5% [3·0–6·0]) | 194 (3·9% [2·4–5·4]) | |
| 20–24 | 836 (16·9% [15·4–18·3]) | 802 (16·1% [14·7–17·6]) | |
| 25–29 | 1478 (29·8% [28·4–31·3]) | 1495 (30·1% [28·6–31·6]) | |
| 30–34 | 1521 (30·7% [29·2–32·2]) | 1579 (31·8% [30·3–33·3]) | |
| 35–39 | 747 (15·1% [13·6–16·6]) | 754 (15·2% [13·7–16·7]) | |
| ≥40 | 149 (3·0% [1·5–4·5]) | 144 (2·9% [1·4–4·4]) | |
| Missing | 0 | 0 | |
| SIMD quintile | |||
| 1 (most deprived) | 1330 (26·8% [25·4–28·3]) | 1241 (25·0% [23·6–26·4]) | |
| 2 | 1155 (23·3% [21·9–24·8]) | 1058 (21·3% [19·9–22·8]) | |
| 3 | 892 (18·0% [16·6–19·5]) | 891 (17·9% [16·5–19·4]) | |
| 4 | 880 (17·8% [16·3–19·2]) | 977 (19·7% [18·2–21·1]) | |
| 5 (least deprived) | 691 (13·9% [12·5–15·4]) | 781 (15·7% [14·3–17·2]) | |
| Missing or unknown | 7 (0·1% [0–1·6]) | 20 (0·4% [0–1·9]) | |
| Ethnicity | |||
| White | 4535 (91·5% [90·8–92·2]) | 4532 (91·2% [90·5–92·0]) | |
| South Asian | 133 (2·7% [2·0–3·4]) | 129 (2·6% [1·9–3·3]) | |
| Black, Caribbean, or African | 61 (1·2% [0·5–1·9]) | 80 (1·6% [0·9–2·3]) | |
| Other or mixed ethnicity | 140 (2·8% [2·1–3·5]) | 121 (2·4% [1·7–3·2]) | |
| Missing or unknown | 86 (1·7% [1·0–2·4]) | 106 (2·1% [1·4–2·9]) | |
| Vaccination status at time of infection | |||
| Unvaccinated | 3006 (60·7% [59·3–62·1]) | 1227 (24·7% [23·2–26·2]) | |
| One dose | 720 (14·5% [13·1–16·0]) | 385 (7·7% [6·3–9·2]) | |
| Two doses | 1198 (24·2% [22·8–25·6]) | 2375 (47·8% [46·3–49·3]) | |
| Three or more doses | 31 (0·6% [0–2·1]) | 981 (19·7% [18·3–21·2]) | |
Data are n (% [95% CI]). The delta (B.1.617.2)-dominant period was defined as the period between May 17, 2021, and Dec 14, 2021. The omicron (B.1.1.529)-dominant period was defined as the period between Dec 15, 2021, and Jan 31, 2022. SIMD=Scottish index of multiple deprivation.