Table 1.

Baseline characteristics of participants by randomised group

Characteristics	LAP (n=205)	COCP (n=200)
Age (years)
<35	161 (79)	158 (79)
≥35	44 (21)	42 (21)
Mean (SD)	29.6 (6.7)	29.3 (6.6)
Body mass index
Mean (SD)	27.0 (10.6)	26.3 (5.5)
Missing	12	12
Ever smoker
Yes	38 (26)	39 (26)
No	110 (74)	112 (74)
Missing	57	49
Extent of excision as judged by surgeon*
Complete	188 (92)	181 (90)
Incomplete	17 (8)	19 (10)
Stage of endometriosis*
I	88 (43)	82 (41)
II	73 (36)	76 (38)
III	25 (12)	23 (12)
IV	19 (9)	19 (10)
Self-declared ethnicity
White	186 (91)	183 (92)
Mixed	3 (1)	2 (1)
Asian	5 (2)	3 (1)
Black	2 (1)	3 (1)
Other ethnic group	0 (-)	1 (<1)
Not stated	0 (-)	0 (-)
Missing	9	8
Parity
0	103 (50)	120 (60)
1	46 (22)	34 (17)
2	27 (13)	24 (12)
≥3	16 (8)	11 (7)
Missing	13	11
LAP selection if randomised to LAP (pilot phase recruits n=92)
LNG-IUS	17 (35)	16 (36)
DMPA	21 (44)	23 (52)
LNG-IUS or DMPA	10 (21)	5 (12)
LAP selection if randomised to LAP (main phase recruits n=313)*
LNG-IUS	59 (38)	55 (35)
DMPA	77 (49)	81 (52)
Randomly allocated	21 (13)	20 (13)
Mode of LAP selection† (main phase recruits n=313)*
Patient’s preference	126 (80)	128 (82)
Clinician advice	10 (6)	8 (5)
Neither	21 (13)	20 (13)
Previous treatment (more than one modality possible)‡
LNG-IUS	27 (7)	21 (5)
DMPA	31 (8)	28 (7)
COCP	48 (12)	44 (11)

Data are number (%) of participants unless stated otherwise.

COCP=combined oral contraceptive pill; DMPA=depot medroxyprogesterone acetate; LAP=long acting progestogen; LNG-IUS=levonorgestrel releasing intrauterine system; SD=standard deviation.

^*Minimisation variable.

^†Selection before randomisation.

^‡Figures might total more than number randomised because treatments are not mutually exclusive.