Table 1. Summary of patient demographics and characteristics.

Characteristic	Training (N=265, three patients without stage information)	Test (N=133, one patient without stage information)
Gender
Female	65 (24.5%)	42 (31.6%)
Male	200 (75.5%)	91 (68.4%)
Age
<60 years	64 (24.2%)	25 (18.8%)
≥60 years	201 (75.8%)	108 (81.2%)
Stage
I	2 (0.8%)	2 (1.5%)
II	77 (29.1%)	46 (34.6%)
III	89 (33.6%)	45 (33.8%)
IV	94 (35.5%)	39 (29.3%)
Vital status
Living	165 (62.3%)	75 (56.4%)
Dead	100 (37.7%)	58 (43.6%)