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Table 4 Correlation analysis of parotid glands V30 and volumetric and positional variations

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

  Pearson correlation Sig. (2-tailed)
GTVnx 0.226 0.002
GTVnx reduction −0.200 0.006
GTVnd −0.120 0.129
GTVnd reduction 0.041 0.610
PG volume 0.006 0.938
PG volume reduction 0.052 0.447
D1 0.052 0.482
D1 reduction −0.097 0.184
DLM 0.089 0.224
DLM shift −0.114 0.118
DMM 0.090 0.220
DMM shift 0.281 0.000
  1. Abbreviations: D1 represents the transverse diameter of the nasopharyngeal level. The other abbreviations are the sa me as the Table 2.