How many periods does a woman have in her lifetime?

How many periods does a woman have in her lifetime? The median number of lifetime menstrual cycles was 451.3, corresponding to 34.7 years of menstrual activity if considering an average of 13 cycles per year.

The median number of lifetime menstrual cycles was 451.3, corresponding to 34.7 years of menstrual activity if considering an average of 13 cycles per year.