Table 2. The association between NLR and clinicopathological features of SCLC.

Variables	Studies	OR [95% CI]	P value	Heterogeneity		Model
				I2 (%)	P2 value
(1) Sex (Male vs. Female)	9	0.75 [0.50–1.15]	0.19	63	0.006	random
(2) Age (≥ 60 vs. < 60)	4	0.81 [0.38–1.73]	0.58	80	0.002	random
(3) Clinical stage (E vs. L)	7	2.14 [1.35–3.39]	0.001	67	0.005	random
(4) Smoking (Yes vs. No)	6	0.98 [0.63–1.51]	0.92	53	0.06	random

L:limited stage; E:extensive stage