title: [Effect of sexual abstinence on pregnancy rates after an intrauterine insemination].
abstract: BACKGROUND
  There are many studies showing that more days of sexual abstinence increased sperm concentration, however, the direct influence between the days of abstinence and pregnancy rates has not been evaluated. The usual recommendation is 3-4 days prior to intrauterine insemination; this based on the interval that maximizes the number of motile sperm in the ejaculate. There are some reports with better success rate when abstinence is less than three days.
  
  
  OBJECTIVE
  To evaluate the pregnancy rate post-intrauterine insemination according to days of sexual abstinence prior to obtaining semen sample.
  
  
  METHODS
  A retrospective, observational and transversal study in patients attending the Mexican Center for Fertility (CEPAM) to intrauterine insemination. For analysis patients were grouped by age group, success rate and days of sexual abstinence. Continuous variables are reported as means and standard deviations; to determine statistical significance univariate logistic regression was performed. Categorical variables were evaluated in frequencies and percentages. The calculations were performed using JMP software program.
  
  
  RESULTS
  3,123 couples were included and increased success rate for intrauterine insemination was obtained with less than seven days of sexual abstinence. The rate of sperm retrieval is inversely proportional to the days of abstinence.
  
  
  CONCLUSIONS
  A better pregnancy rate in intrauterine insemination was achieved with less than seven days of sexual abstinence and sperm retrieval rate was also recorded with fewer days of abstinence.
authors.forename: Alberto
authors.initials: A
authors.lastname: Kably-Ambe
authors.forename: Esperanza
authors.initials: E
authors.lastname: Carballo-Mondragón
authors.forename: Leonor
authors.initials: L
authors.lastname: Durán-Monterrosas
authors.forename: Karla Patricia
authors.initials: KP
authors.lastname: Soriano-Ortega
authors.forename: Armando Miguel
authors.initials: AM
authors.lastname: Roque-Sánchez
mesh_terms: D000328:Adult; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007317:Insemination, Artificial, Homologous / Q000379:methods*; D008297:Male; D011247:Pregnancy; D018873:Pregnancy Rate; D012189:Retrospective Studies; D012746:Sexual Abstinence / Q000502:physiology*; D013076:Sperm Count; D013081:Sperm Motility; D053625:Sperm Retrieval; D013997:Time Factors