Pregnancy outcomes for women admitted with SARS-CoV-2 infection during the period when omicron was the dominant variant, by admission group in the UK between 15 December 2021 and 14 March 2022
| With symptoms (n=986) | Without symptoms (n=2713) | |||
| No | % (95% CI) | No | % (95% CI) | |
| Known to have been discharged while still pregnant* | 314 | 31.9 (29.0 to 34.9) | 293 | 10.8 (9.7 to 12.0) |
| Pregnant, not known to have been discharged* | 115 | 11.7 (9.8 to 13.8) | 135 | 5.0 (4.2 to 5. |
| Pregnancy outcome known:† | 556 | 56.4 (53.3 to 59.5) | 2 285 | 84.2 (82.8 to 85.6) |
| Pregnancy loss | 10 | 1.0 (0.5 to 1.9) | 52 | 1.9 (1.5 to 2.5) |
| Births | 546 | 55.4 (52.3 to 58.5) | 2 233 | 82.3 (80.8 to 83.7) |
| Gestation at birth (weeks+days):‡ | ||||
| <22 | 0 | 0.0 | 1 | 0.1 (0.0 to 0.3) |
| 22+0-27+6 | 4 | 0.7 (0.2 to 2.0) | 15 | 0.7 (0.4 to 1.1) |
| 28+0-33+6 | 20 | 3.7 (2.4 to 5.6) | 48 | 2.2 (1.6 to 2.9) |
| 34+0-36+6 | 63 | 11.6 (9.1 to 14.6) | 174 | 7.8 (6.8 to 9.0) |
| 37+0 or more | 457 | 84.0 (80.7 to 86.9) | 1 982 | 89.3 (87.9 to 90.5) |
| Missing data | 2 | — | 13 | — |
| Birth expedited due to covid-19‡ | 23 | 4.2 (2.8 to 6.3) | 0 | 0.0 |
| Mode of birth:‡ | ||||
| Caesarean before labour onset | 158 | 29.1 (25.4 to 33.1) | 540 | 24.3 (22.5 to 26.1) |
| Caesarean after labour onset | 83 | 15.3 (12.5 to 18.6) | 325 | 14.6 (13.2 to 16.1) |
| Operative vaginal | 50 | 9.2 (7.0 to 12.0) | 258 | 11.6 (10.3 to 13.0) |
| Unassisted vaginal | 252 | 46.4 (42.3 to 50.6) | 1 102 | 49.5 (47.5 to 51.6) |
| Missing data | 3 | — | 8 | — |
*Excluding one woman who died while still pregnant.
†Pregnancy outcome information received by UKOSS in primary report or in supplementary update before 19 April 2022.
‡ Births to women with known pregnancy outcome as denominator, excluding pregnancy loss.