PBAC score after treatment (descriptive results)
Study	LNG IUS group	Ablation group	Follow‐up	Statistical test	Notes
Barrington 2003	Median = 19, range 0 to 100 n = 21	Median = 27, range 0 to 424 n = 23	6 months	Mann‐Whitney test P value 0.69 (no significant difference between groups)	Pre‐operative menstrual PBAC scores differed between groups, P value = 0.02
Crosignani 1997	Mean = 38.8, SD = 37.1 n = 30	Mean = 23.5, SD = 32.6 n = 30	12 months	Mann‐Whitney U test P value 0.015 favouring ablation
Ergun 2012	Mean = 70, no measure of variation reported n = 18	Mean = 55, no measure of variation reported n = 24	12 months	Mann Whitney U test No significant difference between groups
Kittelsen 1998	Median = 7.0 Range = 0 to 101 n = 19	Median = 4.0 Range = 0 to 182 n = 22	36 months	Wilcoxon rank sum test (difference from baseline between groups) P value = 0.86
Shaw 2007	Median = 26, range 0 to 68 n = 21	Median = 62, range 0 to 142 n = 20	12 months	Mann Whitney test, P < 0.001, favouring LNG IUS
TALIS 2006	Mean = 20.6 SD = 28.8 n = 37	Mean = 75.4 SD = 91.1 n= 31	24 months	Wilcoxon test, P value = 0.002, favouring LNG IUS