This statistic can be displayed in two different options.
Winning month is a month in which your monthly performance was higher than zero. Losing month is a month in which your monthly performance was lower than zero. Zero returns are considered to be neither winning or losing.
Percent
Winning Months (%) or Losing Months (%) displays percentage of winning and losing months from your monthly performance data.
Number
Number of Positive Months displays a sum of yours winning months from your monthly performance data. Number of Losing Months display a sum of yours losing months from your monthly performance data.