Replanning Criteria and Timing Definition for Parotid Protection-Based Adaptive Radiation Therapy in Nasopharyngeal Carcinoma

Table 4

Consistency check of single factors.

Parameter	Sensitivity; (%)	Specificity; (%)	Positive predictive value (%)	Negative predictive value (%)	Kappa value	value
Initial parotid volume; > 52.80 cm^3	73.1	41.7	57.6	58.8	0.149	0.27
Initial parotid > 32.04 Gy	42.3	79.2	68.8	55.9	0.211	0.10
Weight loss rate at 11th; fraction > 2.30%	50.0	66.7	61.9	55.2	0.165	0.23
Weight loss rate at 16th; fraction > 3.60%	57.7	54.2	57.7	54.2	0.119	0.40
Weight loss rate at 21st; fraction > 4.40%	73.1	25	56.4	41.2	0.200	0.88