Table 1.
Clinical and pathologic characteristics of patients with HNSCC in the training, Internal validation, and external validation cohorts
| Clinical Characteristics | Training Cohort (n = 267) | Internal validation cohort (n = 115) | External validation cohort (n = 134) | P value | ||
|---|---|---|---|---|---|---|
| Age (mean ± SD, years) | 61.70 ± 8.50 | 59.85 ± 8.16 | 58.76 ± 8.63 | 0.003 | ||
| Histological differentiation | 0.505 | |||||
| Well | 31 (11.61%) | 11 (9.57%) | 14 (10.45%) | |||
| Moderately | 115 (43.07%) | 48 (41.74%) | 47 (35.07%) | |||
| Poorly | 121(45.32%) | 56 (48.69%) | 73 (54.48%) | |||
| T stage | 0.043 | |||||
| 2 | 89 (33.33%) | 30 (26.09%) | 46 (34.33%) | |||
| 3 | 120 (44.94%) | 46 (40.00%) | 46 (34.33%) | |||
| 4 | 58 (21.73%) | 39 (33.91%) | 42 (31.34%) | |||
| N stage | 0.321 | |||||
| 0 | 85 (31.84%) | 34 (29.57%) | 33 (24.63%) | |||
| 1 | 83 (31.09%) | 31 (26.96%) | 40 (29.85%) | |||
| 2 | 92 (34.46%) | 42 (36.52%) | 53 (39.55%) | |||
| 3 | 7 (2.61%) | 8 (6.95%) | 8 (5.97%) | |||
| Smoking | 0.519 | |||||
| No | 72 (27.00%) | 29 (25.22%) | 42 (31.34%) | |||
| Yes | 195 (73.00%) | 86 (74.78%) | 92 (68.66%) | |||
| Drink | 0.758 | |||||
| No | 185(85.5%) | 79 (68.70%) | 88 (65.67%) | |||
| Yes | 82 (14.5%) | 36 (31.30%) | 46 (34.33%) | |||
| Sex | 0.196 | |||||
| Male | 238 (89.14%) | 109 (76.20%) | 123 (91.79%) | |||
| Female | 29(10.86%) | 6 (23.80%) | 11 (8.21%) |
P value < 0.05 is considered as a significant difference.SD, standard deviation