Quantitative hormone changes during the menstrual cycle for estradiol and progesterone of all 8 female subjects.

<p>For clarification, time points are connected by straight lines. Note: only half of the subjects were measured at t4; part of the lines overlie. All but one subjects showed hormone levels within physiological levels and indicating ovulatory cycles: This is an increase of estradiol levels at t2 and/or elevated progesterone levels after t2. One subject showed no increase in progesterone at t3, indicating missing ovulation, and was excluded from further studies, along with the matched male.