. 2017 Apr 27;12(4):e0176231. doi: 10.1371/journal.pone.0176231

Table 2. Optimal cutoff point: Total number of lymph node metastasis vs. survival.

Training (n = 497)			Testing (n = 300)
Methods	Cutoff point			Recurrence				Death
Methods	Recurrence	Death		NMLN^*	Stage	Histology		NMLN^*
Log-rank test	5	5	HR^*	6.653	163.2	1	0.117	5.781
Log-rank test	5	5	HR^*	6.653	163.2	2	0.283	5.781
Likelihood ratio test	5	5	p	0.007	0.0004	1	0.004	0.035
Likelihood ratio test	5	5	p	0.007	0.0004	2	0.281	0.035

* NMLN: number of metastatic lymph nodes, HR: hazard ratio. HR1 for histology was the hazard ratio of squamous cell carcinoma vs. other types, and HR2, adenocarcinoma vs. other types.