1. Human chorionic gonadotropin as a predictor of outcome in assisted reproductive technology pregnancies 
Gillian Homan, Susan Brown, R.N., John Moran, M.B.B.S., Sean Homan, John Kerin, M.D. 
Fertility and Sterility 
Volume 73, Issue 2, Pages (February 2000)
DOI: /S (99)

2. Figure 1
Pregnancy outcome probability based on intact and total hCG modeled separately and in combination. Age ≤40 years. Mean and 95% CI. ○, combined; ▵, intact hCG; ▾, total hCG.
Homan. Human chorionic gonadotropin. Fertil Steril 2000.
Fertility and Sterility  , DOI: ( /S (99) )

3. Figure 2
Probability of ongoing pregnancy is predicted by hCG levels at 16 days after ovulation. Mean and 95% CI. ♦, ≤40 years; □, >40 years.
Homan. Human chorionic gonadotropin. Fertil Steril 2000.
Fertility and Sterility  , DOI: ( /S (99) )