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Table 3 Variation in individual post-void residual (PVR) volume readings over the course of the study, stratified by therapy cohort, alpha-blocker use, baseline PVR volume group, and radiation cohort.

From: cExternal beam radiation results in minimal changes in post void residual urine volumes during the treatment of clinically localized prostate cancer

Parameter Group Number of patients Mean of N weeks of PVR readings p-value Mean Std. Dev. of N PVR readings p-value
    Mean ± SD   Mean ± SD  
Alpha-blocker use No 29 26.5 ± 29.3 0.027 22.3 ± 18.8 0.011
  Yes 96 54.7 ± 65.6   35.7 ± 36.9  
Baseline PVR volume ≤ 40 cc 76 23.2 ± 31.7 < 0.001 23.4 ± 32.7 <0.001
  > 40 cc 49 86.9 ± 72.7   46.7 ± 31.4  
Radiation cohort Prostate only 66 46.3 ± 55.4 0.725 29.7 ± 21.6 0.317
  Pelvis 59 50.2 ± 65.6   35.8 ± 43.9  
Overall population   125 48.2 ± 60.2   32.5 ± 34.0  
  1. * The median number N of PVR readings was 10.
  2. p-values were calculated by independent samples t-test.