1. Differences in hormonal characteristics of conceptive versus nonconceptive menstrual cycles 
Hongxia Li, M.D., Steven T Nakajima, M.D., Jiangang Chen, M.D., Heather E Todd, M.S., James W Overstreet, M.D., Ph.D., Bill L Lasley, Ph.D. 
Fertility and Sterility 
Volume 75, Issue 3, Pages (March 2001)
DOI: /S (00)

2. Figure 1
Serum E2 profile in six pairs of conceptive (open circles) and nonconceptive (closed circles) cycles. Data are presented as mean ± SD. Day 0 is the day of peak urinary FSH concentration. The E2 level is significantly higher on day 0 in conceptive cycles (P<.05, paired t-test).
Li. Hormonal characteristics of menstrual cycles. Fertil Steril 2001.
Fertility and Sterility  , DOI: ( /S (00) )

3. Figure 2
Urinary estrone conjugate (E1C) profile in 13 pairs of conceptive (open circles) and nonconceptive (closed circles) cycles. Data are presented as mean ± SD. Day 0 is the day of peak urinary FSH concentration. The peak E1C level occurred 2 days later in conceptive cycles compared with nonconceptive cycles. The difference between E1C values in conceptive cycles and nonconceptive cycles was not significant (P>.05, paired t-test).
Li. Hormonal characteristics of menstrual cycles. Fertil Steril 2001.
Fertility and Sterility  , DOI: ( /S (00) )

4. Figure 3
Urinary FSH profile in 14 pairs of conceptive (open circles) and nonconceptive (closed circles) cycles. Data are presented as mean ± SD. Day 0 is the day of peak urinary FSH concentration. The peak FSH values in conceptive cycles and nonconceptive cycles differed significantly (P<.05, paired t-test).
Li. Hormonal characteristics of menstrual cycles. Fertil Steril 2001.
Fertility and Sterility  , DOI: ( /S (00) )