Table 1 Demographic characteristics of study participants compared to those would did not consent and participants in a previous cohort study in the same centre

Age

28 (18–42)

27 (19–37)

29 (13–46)

BMI

25 (18–50)

26 (15–38)

25 (14–63)

Gravidity

2 (1–9)

2(1–4)

-

Parity

1 (0–5)

0 (0–2)

0 (0–15)

Ethnicity

Bangladeshi

6 (5%)

1 (6%)

134 (2%)*

Black African

8 (7%)

7 (41%)

612 (9%)*

Black Caribbean

3 (3%)

1 (6%)

138 (2%)*

Indian

4 (3%)

3 (18%)

191 (3%)*

Pakistani

19 (16%)

1 (6%)

865 (13%)*

White European

74 (62%)

2 (12%)

4,875 (71%)*

Other ethnic groups

6 (5%)

2(12%)

50 (1%)*

Cigarette Smoker

12 (10%)

Unknown

723 (10%)^†

Gestation at Presentation

38⁺⁶ (36⁺⁰–41⁺¹)

38⁺⁴ (36⁺²–40⁺⁵)

-