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Table 1 Comparisons of the absolute and percentage reductions in weekly CTV and GTV

From: Predictors for replanning in loco-regionally advanced nasopharyngeal carcinoma patients undergoing intensity-modulated radiation therapy: a prospective observational study

Target volume Comparison Absolute reduction (mean + SD, mL) Percentage reduction (mean, %) t P
CTV CTV0* vs CTV1 10.95 ± 1.35 1.8 8.07 <0.0001
  CTV1 vs CTV2 10.91 ± 2.18 1.8 2.18 <0.0001
  CTV2 vs CTV3 12.27 ± 3.17 2.9 5.44 <0.0001
  CTV3 vs CTV4 23.63 ± 4.03 3.7 5.86 <0.0001
  CTV4 vs CTV5 13.69 ± 2.12 2.2 6.46 <0.0001
GTV GTV0* vs GTV1 8.80 ± 1.25 10.3 7.05 <0.0001
  GTV1 vs GTV2 5.98 ± 1.74 6.8 3.44 0.0027
  GTV2 vs GTV3 8.79 ± 2.14 9.9 4.10 0.0006
  GTV3 vs GTV4 8.01 ± 2.75 10.5 2.91 0.009
  GTV4 vs GTV5 6.20 ± 0.93 9.1 6.63 <0.0001
  1. *The pretreatment volumes were labeled week 0.