Table 3. Comparison of studies on NLR based on survival outcome.

NLR: Neutrophil-lymphocyte ratio

Study	Type	Survivor numbers	Survivor mean NLR ± SD	Non-survivor numbers	Non-survivor mean NLR ± SD	P-value	Critical values
Chennai, South India -  One-year critical care retrospective study, 2020-2021	Initial	154	7.96±11.45	53	13.6±14.3	0.004	>12.29
	Peak		23.53±33.73		35.72±25.15	0.010	>23.68
Davangere, South India - Two-month retrospective study, 2020 [17]	Initial	75	8.88±2.84	25	4.87±3.7	0.004	>4.7
Wuhan, China - 76 days, retrospective study, 2020 [16]	Initial	297	2.53 (1.79-6.74)	52	15.96	<0.001	>7.13
	Peak		4.14 (2.11-12.32)		46.50	<0.001	>14.31
Wuhan, China - 46 days, retrospective study of older patients, 2020 [18]	Initial	67	4.1±2.9	51	13.3±14.9	<0.001	>7.945
Wuhan, China, - 42 days, retrospective study of critically ill patients, 2020 [19]	Initial	50	8.4±7.5	10	18.7±16.6	0.030	-
Wuhan, China - 27 days, retrospective study of adult patients, 2020 [20]	Initial	268	3.40 (1.97-6.16)	47	12.27 (5.12-20.56)	0.001	>8.0