Table 1 Baseline characteristics

Age n: mean (SD) [range]

24: 35.2 (7.5) [20.8, 48.6]

11: 33.3 (8.7) [20.8, 47.5]

13: 36.9 (6.2) [26.1, 48.6]

Ethnicity N (%)

 White

18 (75.0)

8 (72.7)

10 (76.9)

 Mixed/multiple

3 (12.5)

1 (9.1)

2 (15.4)

 Asian

2 (8.3)

1 (9.1)

1(7.7)

 Missing

1 (4.2)

1 (9.1)

0 (0)

Employment status N (%)

 Unemployed

5 (20.8)

3 (27.3)

2 (15.4)

 Part-time work

10 (41.7)

3 (27.3)

7 (53.8)

 Full-time work

5 (20.8)

2 (18.2)

3 (23.1)

 Student

1 (4.2)

1 (9.1)

0 (0.0)

 Maternity leave

4 (16.7)

3 (27.3)

1 (7.7)

 Other

1 (4.2)

1 (9.1)

0 (0.0)

 Missing

1 (4.2)

1 (9.1)

0 (0.0)

Comorbid status N (%)

 None

12 (50.0)

2 (18.2)

10 (76.9)

 CHD/hypertension

1 (4.2)

1 (9.1)

0 (0.0)

 Diabetes

1 (4.2)

0 (0.0)

1 (9.1)

 COPD/asthma

1 (4.2)

1 (9.1)

0 (0.0)

 Migraine

1 (4.2)

1 (9.1)

0 (0.0)

 Depression and/or anxiety

7 (29.2)

5 (45.5)

2 (15.4)

 Hypermobility

5 (20.8)

1 (9.1)

4 (30.8)

 Other

8 (33.3)

5 (45.5)

3 (23.1)

 Missing

1 (4.2)

1 (9.1)

0 (0.0)

BMI (kg/m²) n: mean (SD) [range]

 Pregnancy details n: mean (SD) [range]

23: 27.0 (4.9) [17.4, 34.9]

10: 26.8 (5.0) [17.4, 34.4]

13: 27.1 (5.0) [20.5, 34.8]

 Number of children

23: 1.5 (0.7) [1.0, 3.0]

10: 1.5 (0.7) [1.0, 3.0]

13: 1.5 (0.7) [1.0, 3.0]

 Number of pregnancies

23: 2.1 (1.3) [1.0, 5.0]

10: 2.3 (1.6) [1.0, 5.0]

13: 1.9 (1.0) [1.0, 4.0]