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Table 1 Comparison of the different characteristics between patients in the primary and validation cohorts

From: A nomogram for predicting survival of head and neck mucosal melanoma

Characteristic Number of patients (%) P-value
Primary patients
(n = 300)
Validation cohort
(n = 182)
Gender 0.944
 Male 182 (60.7) 111 (61.0)
 Female 118 (39.3) 77 (39.0)
Age (years old) 0.373
  < 60 174 (58.0) 98 (53.8)
 ≥ 60 126 (42.0) 84 (46.2)
Smoking 0.064
 No 220 (73.3) 119 (65.4)
 Yes 80 (26.7) 63 (34.6)
Primary site 0.753
 Others 44 (14.7) 23 (12.6)
 Nasal cavity 159 (53.0) 100 (54.9)
 Paranasal sinus 24 (8.0) 11 (6.0)
 Oral cavity 73 (24.3) 48 (26.4)
8th T stage 0.966
 T3 121 (40.3) 73 (40.1)
 T4a 129 (43.0) 77 (42.3)
 T4b 50 (16.7) 32 (17.5)
8th N stage 0.604
 N0 224 (74.7) 132 (72.5)
 N1 76 (25.3) 50 (27.5)
Surgery 0.933
 No 21 (7.0) 13 (7.1)
 Yes 170 (56.7) 100 (54.9)
 Reoperation 109 (36.3) 69 (37.9)
Radiotherapy  < 0.001
 No 179 (59.7) 129 (70.9)
 2D 22 (7.3) 22 (12.1)
 IMRT 99 (33.0) 31 (17.0)
Chemotherapy 0.377
No 131 (43.7) 87 (47.8)
Yes 169 (56.3) 95 (52.2)
Immunotherapy 0.659
No 217 (72.3) 135 (74.2)
Yes 83 (27.7) 47 (25.8)
  1. All continuous variables were changed to categorical variables. Pearson χ2 test was used to compute the P-value