Table 1 Details of participants included in the pilot phase

Age, years

Mean (SD)

31 (7.5)

Age <35 years, n (%)

Yes

53 (69)

Missing

0

BMI, kg/m²

Mean (SD)

27 (5.7)

Missing

17

Ethnic group, n (%)

White British

64 (86)

Black/Black British Caribbean

2 (3)

Asian/Asian British Indian

3 (4)

Asian/Asian British Pakistani

1 (1)

Mixed White/Black Caribbean

2 (3)

Mixed White/Asian

1 (1)

Other mixed background

1 (1)

Missing

3

Stage of endometriosis, n (%)

I

36 (47)

II

20 (26)

III

11 (14)

IV

10 (13)

Missing

0

Ever smoked? n (%)

Yes

34 (48)

Missing

6

Extent of excision as judged by surgeon, n (%)

Complete

71 (92)

Missing

0

EHP-30 pain score

Mean (SD)

58 (18.5)

Missing

2