Journal of Andrology Proceedings of the Fifth International Conference on the Epididymis
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Table 3. Estimated parameters (and P values) for linear regression models of differences in semen quality*
    Difference Between First and Second Sample
    Log Concentration   Volume   Motility   Morphology (Strict)

  Intercept   –0.25 (.203)   0.015 (.867)   –1.105 (.129)   –0.064 (.765)
  Difference in abstinence time   0.002 (<.0001)   0.009 (<.0001)   –0.013 (.185)   –0.001 (.628)
  Difference in time to start analysis   –0.001 (.241)   0.004 (.228)   –0.074 (.017)   –0.013 (.151)
  Center location        
      Minnesota   –0.008 (.763)   0.043 (.720)   0.110 (.913)   –0.294 (.325)
      Missouri   0.014 (.314)   0.093 (.450)   1.131 (.275)   –0.250 (.414)
      Iowa   0.022 (.505)   0.012 (.936)   –4.620 (.0002)   –0.412 (.257)

  *Rows indicate independent variables, and columns indicate model outcomes





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