Pregnancy rates with recombinant versus urinary human chorionic gonadotropin in in vitro fertilization: an observational study.

However, the association between the use of rhCG and pregnancy was almost significant ( P = 0.056) in the logistic regression model when the contribution of GnRH agonists (associated with higher rates), age, and number of previous attempts (associated with lower rates) were also taken into account.

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