Table 1 Sociodemographic characteristics and vaccination status of pregnant women admitted with SARS-CoV-2, by symptom group, March 1, 2020, to March 31, 2022, United Kingdom

From: Perinatal outcomes after admission with COVID-19 in pregnancy: a UK national cohort study

Symptom group

Asymptomatic (N = 9374)

Mild infection (N = 4901)

Moderate to severe infectiona (N = 2352)

Age (years)—no. (%)

  <20

231 (2.5)

100 (2.0)

21 (0.9)

  20-34

6685 (71.5)

3583 (73.2)

1544 (65.8)

  ≥35

2438 (26.1)

1210 (24.7)

782 (33.3)

  Missing

20

8

5

Body Mass Index (BMI) (kg/m2) - no. (%)

  Underweight (<18.5)

229 (2.5)

101 (2.1)

17 (0.8)

  Normal (18.5 to <25)

3599 (39.7)

1829 (38.5)

529 (23.4)

  Overweight (25 to <30)

2702 (29.8)

1467 (30.9)

714 (31.6)

  Obese ( ≥ 30)

2528 (27.9)

1357 (28.5)

1000 (44.3)

  Missing

316

147

92

Woman or partner in paid work - no. (%)

7010 (74.8)

3788 (77.3)

1791 (76.2)

Ethnic Group - no. (%)

  White

6107 (66.7)

3134 (65.4)

1350 (58.9)

  Asian

1689 (18.5)

934 (19.5)

519 (22.6)

  Black

825 (9.0)

418 (8.7)

254 (11.1)

  Chinese/Other

282 (3.1)

178 (3.7)

110 (4.8)

  Mixed

249 (2.7)

129 (2.7)

59 (2.6)

  Missing

222

108

60

Current smoking - no. (%)

1547 (17.0)

626 (13.1)

178 (7.8)

  Missing

294

138

68

Vaccination status - no. (%)

  Unvaccinated

6099 (65.1)

3424 (69.9)

1785 (75.9)

  1 dose

620 (6.6)

271 (5.5)

72 (3.1)

  2 doses

835 (8.9)

290 (5.9)

41 (1.7)

  3 doses

140 (1.5)

53 (1.1)

4 (0.2)

  Not known/

not documented

1680 (17.9)

863 (17.6)

450 (19.1)

  1. aModerate to severe COVID-19 was defined as one or more of the following: maternal death, intensive care unit admission, peripheral oxygen saturation below 95% at admission, pneumonia on imaging, or need for respiratory support with either oxygen, high flow nasal cannula or continuous positive pressure mask, mechanical ventilation or extracorporeal membrane oxygenation.
  2. b27 (0.3%) asymptomatic women needed respiratory support or were admitted to ICU for other reasons and one of them died from other causes than COVID-19.