title: Predicting live birth chances for women with multiple consecutive failing IVF cycles: a simple and accurate prediction for routine medical practice.
abstract: BACKGROUND
  Women having experienced several consecutive failing IVF cycles constitute a critical and particular subset of patients, for which growing perception of irremediable failure, increasing costs and IVF treatment related risks necessitate appropriate decision making when starting or not a new cycle. Predicting chances of LB might constitute a useful tool for discussion between the patient and the clinician. Our essential objective was to dispose of a simple and accurate prediction model for use in routine medical practice. The currently available predictive models applicable to general populations cannot be considered as accurate enough for this purpose.
  
  
  METHODS
  Patients with at least four consecutive Failing cycles (CFCs) were selected. We constructed a predictive model of LB occurrence during the last cycle, by using a stepwise logistic regression, using all the baseline patient characteristics and intermediate stage variables during the four first cycles.
  
  
  RESULTS
  On as set of 151 patients, we identified five determinant predictors: the number of previous cycles with at least one gestational sac (NGS), the mean number of good-quality embryos, age, male infertility (MI) aetiology and basal FSH. Our model was characterized by a much higher discrimination as the existing models (C-statistics=0.76), and an excellent calibration.
  
  
  CONCLUSIONS
  Couples having experienced multiple IVF failures need precise and appropriate information to decide to resume or interrupt their fertility project. Our essential objective was to dispose of a simple and accurate prediction model to allow a routine practice use. Our model is adapted to this purpose: It is very simple, combines five easily collected variables in a short calculation; it is more accurate than existing models, with a fair discrimination and a well calibrated prediction.
authors.affiliation: Institut de Médecine de la Reproduction, Marseille F-13417, France.
authors.forename: Géraldine
authors.initials: G
authors.lastname: Porcu
authors.forename: Philippe
authors.initials: P
authors.lastname: Lehert
authors.forename: Carolina
authors.initials: C
authors.lastname: Colella
authors.forename: Claude
authors.initials: C
authors.lastname: Giorgetti
mesh_terms: D005260:Female; D005307:Fertilization in Vitro / Q000379:methods; D005640:Follicle Stimulating Hormone / Q000097:blood; D006801:Humans; D007231:Infant, Newborn; D007247:Infertility, Female / Q000209:etiology / Q000628:therapy; D007248:Infertility, Male / Q000628:therapy; D050498:Live Birth; D016015:Logistic Models; D008297:Male; D011247:Pregnancy; D017211:Treatment Failure
chemical_list: D005640:Follicle Stimulating Hormone