GSTM1 and Menorrhagia: Most of the studies used PBAC scores (125 studies, of which 57 studies included at least PBAC) to report on the treatment effects, followed by percentage comparisons of symptoms before and after treatment (34 studies), subjective descriptions such as ‘less heavy’ and ‘lighter’ (17 studies), number of pads used (11 studies), or other indicators [29] such as hemoglobin (Hb) level, menorrhagia multi-attribute scale (MMAS) or other questionnaires, and QoL.