Table 5.

Comparison of the baseline characteristics between the training and validation groups.

Characteristics	Training group	Validation group	p-value
N	485	189
Age, n (%)			0.768
<60	244 (50.3%)	92 (48.7%)
≥60	241 (49.7%)	97 (51.3%)
Sex, n (%)			0.736
Female	235 (48.5%)	95 (50.3%)
Male	250 (51.5%)	94 (49.7%)
TMB, n (%)			0.481
High	82 (16.9%)	37 (19.6%)
Low	403 (83.1%)	152 (80.4%)
Primary tumor location, n (%)			1.000
Left	279 (57.5%)	109 (57.7%)
Right	206 (42.5%)	80 (42.3%)
Stage at diagnosis, n (%)			0.149
I	32 (6.6%)	16 (8.5%)
II	82 (16.9%)	42 (22.2%)
III	121 (24.9%)	51 (27%)
IV	250 (51.5%)	80 (42.3%)

TMB, tumor mutation burden.