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Table 3 Generalized estimating equation models of the association between EPIC scores surgery and SBRT patients

From: Comparison of quality of life after stereotactic body radiotherapy and surgery for early-stage prostate cancer

Variable EPIC urinary EPIC sexual EPIC bowel
  β SE p β SE p β SE p
Intercept 98.9668 4.7493 <.0001 133.2671 9.3670 <.0001 103.1127 2.8919 <.0001
Age −0.0358 0.0695 0.6062 −1.2686 0.1368 <.0001 −0.0954 0.0435 0.0282
Prostate Volume −0.0209 0.0227 0.3557 −0.0014 0.0382 0.9702 −0.0158 0.0121 0.1927
Risk Group
Low Ref.    Ref.    Ref.   
Intermediate-high 0.7602 1.1711 0.5163 1.2493 2.0884 0.5497 0.6897 0.5534 0.2127
Treatment Group (differences at baseline)
Surgery Ref.    Ref.    Ref.   
SBRT −6.1083 1.1334 <.0001 11.1251 2.6339 <.0001 −0.2676 0.6838 0.6956
Interaction surgery x time (change from baseline)
Baseline Ref.    Ref.    Ref.   
1 month −48.5886 3.3500 <.0001 −38.7584 2.7183 <.0001 −2.4796 1.1901 0.0372
6 months −19.2903 2.1428 <.0001 −34.6929 2.2146 <.0001 −0.2362 0.8788 0.7881
12 months −13.3859 1.8891 <.0001 −29.6338 2.2676 <.0001 1.1840 0.7165 0.0984
24 months −14.1136 1.8888 <.0001 −30.1501 2.5436 <.0001 1.4723 0.6095 0.0157
36 months −12.8108 1.6371 <.0001 −27.3960 2.4127 <.0001 2.6794 0.5251 <.0001
Interaction SBRT x time (differences from surgery in change from baseline)
Baseline Ref.    Ref.    Ref.   
1 month 32.8134 3.3992 <.0001 31.3269 2.8315 <.0001 −18.7600 1.4602 <.0001
6 months 17.8838 2.4335 <.0001 30.6081 2.6451 <.0001 −3.5163 1.4358 0.0143
12 months 11.4988 1.9338 <.0001 26.2387 2.3241 <.0001 −2.6986 1.0348 0.0091
24 months 13.3402 1.9474 <.0001 24.6944 2.6305 <.0001 −1.8731 0.9630 0.0518
36 months 13.6449 1.6969 <.0001 19.8132 2.5509 <.0001 −2.5845 0.6613 <.0001