Table 1. Results of the meta-analysis on prognostic significance of NLR in CRLM.

	Overall Survival						Recurrence Free Survival
	No. studies	No. patients	HR	95% CI	I2,%	P value for heterogeneity	No. studies	No. patients	HR	95% CI	I2,%	P value for heterogeneity
Overall	7	1491	2.17	1.82–2.58	0	0.66	6	1093	1.96	1.64–2.35	45.20	0.10
Treatment methods
Surgical resection	5	1309	2.08	1.73–2.49	0	0.74	4	903	1.89	1.34–2.66	58.60	0.07
Non-surgical treatment	2	182	3.11	1.83–5.29	0	0.71	2	190	2.33	1.37–3.95	29.90	0.23
Sample size
≥100	5	1309	2.08	1.73–2.49	0	0.74	3	286	1.79	1.24–2.59	68.20	0.04
<100	2	182	3.11	1.83–5.29	0	0.71	3	807	2.48	1.55–3.98	0	0.42
NLR cutoff
= 5	6	1322	2.17	1.81–2.60	0	0.53	4	826	2.27	1.84–2.80	0	0.69
= 2.5	1	-	-	-	-	-	2	267	1.30	0.91–1.85	0	0.46

NLR: neutrophil-lymphocyte ratio; HR: hazard ratio; CI: confidence interval.