title: [Congression and regression tree analyses on the outcome of ovulation induction in women with polycystic ovary syndrome].
abstract: OBJECTIVE
  To investigate the risk factors for failure of ovulation induction in polycystic ovary syndrome (PCOS) patients and establish congression and regression tree (CART) model.
  
  
  METHODS
  Sex hormones were measured in 103 PCOS patients and 31 healthy women by radioimmunoassay, oral glucose tolerance test (OGTT) and insulin release test were done as well. Three ovulation induction protocols including clomiphene (CC)/chorionic gonadotrophin (hCG), CC/menotrophins (hMG)/hCG and gonadotrophin releasing hormone agonist(GnRH-a)/hMG/hCG were used for PCOS related infertility. Transvaginal ultrasonography was used for monitoring. The correlation between hormone levels and clinical outcomes was analyzed by CART method.
  
  
  RESULTS
  The ovulation rate in patients with 2-hour blood insulin level < or = 68.9 mIU/L during OGTT was 86.9%, which was significantly higher than those with > 68.9 mIU/L (61.9%, P < 0.05). In the model, the insulin and glucose level of 0 min, 60 min during OGTT acted obviously, but estradiol and basal T level did not, the protocol of ovulation induction was not able to enter the model.
  
  
  CONCLUSIONS
  Two hour insulin level during OGTT is the most important factor affecting the outcome of ovulation induction, while the others parameters of glucose and insulin level have useful action too.
authors.affiliation: Department of Obstetrics and Gynecology, The Third Clinical Hospital, Beijing Medical University, Beijing 100083, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.forename: M
authors.initials: M
authors.lastname: Li
authors.forename: Y
authors.initials: Y
authors.lastname: Zhao
mesh_terms: D000328:Adult; D006063:Chorionic Gonadotropin / Q000627:therapeutic use*; D002996:Clomiphene / Q000627:therapeutic use; D003663:Decision Trees; D004359:Drug Therapy, Combination; D005260:Female; D005300:Fertility Agents, Female / Q000627:therapeutic use*; D007987:Gonadotropin-Releasing Hormone / Q000819:agonists; D006801:Humans; D007328:Insulin / Q000097:blood; D008596:Menotropins / Q000627:therapeutic use; D010062:Ovulation Induction / Q000379:methods*; D011085:Polycystic Ovary Syndrome / Q000097:blood / Q000628:therapy*; D016896:Treatment Outcome
chemical_list: D006063:Chorionic Gonadotropin; D005300:Fertility Agents, Female; D007328:Insulin; D002996:Clomiphene; D007987:Gonadotropin-Releasing Hormone; D008596:Menotropins