A novel dosimetric metrics-based risk model to predict local recurrence in nasopharyngeal carcinoma patients treated with intensity-modulated radiation therapy

Table 2 Comparison of dosimetric metrics between recurrent and non-recurrent patients

Metrics	Recurrent group (Gy) (n = 44)	Non-recurrent group (Gy) (n = 88)	P value
D_max	79.72 ± 3.22	78.47 ± 2.80	0.024
D₁	78.60 ± 2.83	77.58 ± 2.56	0.039
D₂	78.22 ± 2.78	77.25 ± 2.50	0.047
D₅	77.65 ± 2.61	76.77 ± 2.41	0.057
D₁₀	77.11 ± 2.48	76.34 ± 2.33	0.083
D₁₅	76.74 ± 2.38	76.06 ± 2.30	0.112
D₂₀	76.42 ± 2.30	75.81 ± 2.24	0.147
D₂₅	76.14 ± 2.24	75.60 ± 2.20	0.187
D₃₀	75.88 ± 2.18	75.39 ± 2.17	0.224
D₃₅	75.63 ± 2.13	75.20 ± 2.13	0.271
D₄₀	75.39 ± 2.10	75.01 ± 2.10	0.331
D₄₅	75.14 ± 2.06	74.82 ± 2.07	0.394
D₅₀	74.90 ± 2.01	74.62 ± 2.05	0.459
D₅₅	74.65 ± 1.99	74.42 ± 2.01	0.541
D₆₀	74.38 ± 1.96	74.20 ± 1.98	0.636
D₆₅	74.10 ± 1.91	73.97 ± 1.95	0.720
D₇₀	73.79 ± 1.86	73.71 ± 1.90	0.826
D₇₅	73.43 ± 1.80	73.41 ± 1.85	0.965
D₈₀	73.00 ± 1.73	73.07 ± 1.80	0.842
D₈₅	72.47 ± 1.65	72.61 ± 1.75	0.665
D₉₀	71.66 ± 1.57	71.96 ± 1.71	0.325
D₉₅	70.04 ± 1.66	70.76 ± 1.71	0.022
D₉₈	67.77 ± 2.40	68.89 ± 1.93	0.005
D₉₉	66.14 ± 3.11	67.52 ± 2.40	0.006
D_min	56.66 ± 7.47	58.71 ± 5.38	0.073
D_ave	74.53 ± 1.87	74.30 ± 1.95	0.519

D_x was defined as the minimum absorbed dose that covers x% of the volume of the target. D_ave represented the average dose of the target. D_min represented the minimum dose of the target. D_max represented the maximum dose of the target
P values were calculated by t test; Data was denoted as mean ± standard deviation

ISSN: 1748-717X