Table 1.

Characteristics of the patients

		Usual medical treatment, n (%)	LNG-IUS, n (%)
N		286	285

Age, years	≥35^a	255 (89)	257 (90)
Age, years	Mean (SD)	41.8 (5.5)	42.1 (5.0)

Body mass index, kg/m²	≥25^a	200 (70)	200 (70)
Body mass index, kg/m²	Mean (SD)	29.3 (6.7)	29.1 (6.1)

Ethnic group^b	White	246 (86)	225 (79)
	Asian	23 (8)	28 (10)
	Black	12 (4)	18 (6)
	Mixed	4 (1)	9 (3)
	Other	1 (<1)	4 (1)

Duration of heavy menstrual bleeding ≥1 year^a		229 (80)	231 (81)

Presence of menstrual pain^a		211 (74)	213 (75)

Contraceptive requirement^a		55 (19)	55 (19)

Copper or non-hormonal coil in place		10 (3)	9 (3)

LNG-IUS = levonorgestrel-releasing intrauterine system.
↵a This characteristic was a minimisation variable and was assessed in the pre-defined subgroup analyses.
↵b Self-identified ethnic grouping; one ‘not given’ response in the LNG-IUS group.