Baseline characteristics
Baseline characteristics were comparable in both groups, apart from the TRM that was smaller in the LNG-IUD group, and there was a trend for higher younger age in the LNG-IUD group (see table1). TRM was not of influence on improvement of postmenstrual spotting on any of the follow-up point during the first year (in the 3rdmonth: P=0.706; the 6th month: P=0.338; the 9th month: P=0.099; the 12th month: P=0.081). The influence of age on improvement of postmenstrual spotting on any of the follow-up point during the first year (in the 3rd month: P=0.015; the 6th month: P=0.131; the 9th month: P=0.123; the 12th month: P=0.102).