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Table 3 Position changes of parotid gland during intensity modulated radiotherapy

From: Rules of parotid gland dose variations and shift during intensity modulated radiation therapy for nasopharyngeal carcinoma

  The first 15 fractions Between fraction 15 and 25
  SCT1 vs. SCT2 SCT2 vs. SCT3
  Mean ± SD 95%CI p Value Mean ± SD 95%CI p Value
Positional changes (mm)       
All-PG       
DLM 2.65 ± 2.12 2.21; 3.09 0.000 1.77 ± 1.96 1.37; 2.11 0.000
DMM −1.25 ± 4.21 −2.12; −0.39 0.005 −0.56 ± 3.29 −1.24; 0.11 0.100
Con-PG       
DLM 0.47 ± 1.07 0.09; 0.85 0.016 1.98 ± 1.83 1.33; 2.63 0.000
DMM −0.53 ± 2.80 −1.52; 0.46 0.281 −2.49 ± 3.22 −3.63; −1.35 0.000
IP-PG       
DLM 3.38 ± 1.53 3.44; 4.23 0.000 1.65 ± 2.04 1.13; 2.17 0.000
DMM 0.80 ± 2.96 0.047; 1.56 0.038 −2.19 ± 3.96 −3.21; −1.18 0.000
  1. Abbreviations: DLM the distance between the lateral aspects of PG and midline, DMM the distance between the medial aspects of PG and midline, The other abbreviations are the same as those in the Table 2.
  2. The positive and negative value for position changes means shift inside and outside, respectively.