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Table 2 Significant predictors of the number of retrieved oocytes and high quality embryos by linear regression.

From: Impact of GnRH ovarian stimulation protocols on intracytoplasmic sperm injection outcomes

  Univariable analysis Multivariable analysis
Parameters R2 Unstandardized coefficients Pvalue Unstandardized coefficients Standardized coefficients Pvalue
Number of retrieved oocytes       
   Protocol (a) 0.072 3.030 < .001 2.667 0.237 < .001
   Female age (b) 0.067 - 1.556 < .001 - 0.854 - 0.142 .010
   Basal FSH (mIU/ml) 0.079 - 0.656 < .001 - 0.343 - 0.147 .009
   Total ovarian volume (cm3) 0.026 0.141 .007    
   Total number of antral follicles 0.141 0.554 < .001 0.459 0.311 < .001
Number of high quality embryos (c)       
   Protocol (a) 0.074 0.379 < .001 0.345 0.247 < .001
   Female age (b) 0.071 - 0.199 < .001 - 0.136 - 0.182 .002
   Basal FSH (mIU/ml) 0.068 - 0.076 < .001 - 0.048 - 0.165 .005
   Total ovarian volume (cm3) 0.015 0.013 .045    
   Total number of antral follicles 0.041 0.037 .001 0.024 0.132 .022
  1. (a) Agonist protocol as reference. (b) For a 5 year increase. (c) Data was log transformed: ln (number of high quality embryos + 1).
  2. Negative coefficients for inversely related variables. Number of retrieved oocytes: model accounts for 25% variability of the number of retrieved oocytes. Number of high quality embryos: model accounts for 17% variability of the number of high quality embryos.