Fig. 4.

Characteristics of the menstrual cycle based on daily blood samples and checks of menses. Only animals that ovulated were included (n = 4 T treated and 5 controls before WSD; n = 6/group 14 mo after WSD). A: total menstrual cycle length. B: follicular phase length. C: luteal phase length. D: peak estrogen. E: average estrogen from D1 to 3. F: peak progesterone. Closed bars, T-treated animals. Open bars, controls. *Significant difference between groups, P = 0.02; †significant difference from before WSD, P < 0.05; #trend toward difference from before WSD, P = 0.062.