The formula to calculate the Average Period Length is:
\[ \text{Average Period Length} = \frac{\sum \text{Period Lengths}}{\text{Number of Periods}} \]
Where:
The average period length is the mean number of days between the start of one period and the start of the next. It helps track menstrual cycle regularity and identify any significant changes.
Consider an example where the period lengths are:
Using the formula to calculate the Average Period Length:
\[ \text{Average Period Length} = \frac{28 + 30 + 27 + 29 + 31}{5} = 29 \]
This means that the average period length for this example is 29 days.