Table 2.

Distribution of peripheral blood cell counts and NLPR in AKI and non-AKI patients (n = 2449).

Blood cell counts	AKI	Non-AKI	Stat. value	p-Value	aOR (95% CI)c	p-Value
Pre-surgery (within 24 h of admission)
Leukocyte (109/L)	6.3 ± 2.5	6.1 ± 1.9	−2.588	0.009†	1.03 (0.99–1.08)	0.112
Neutrophil (109/L)	3.9 ± 2.4	3.5 ± 1.6	−4.018	<0.001†	1.07 (1.02–1.12)	<0.001
Lymphocyte (109/L)	1.7 ± 0.6	1.9 ± 0.7	4.926	<0.001†	0.74 (0.64–0.85)	<0.001
Platelet (109/L)	182.2 ± 59.6	196.4 ± 60.9	5.542	<0.001†	0.99 (0.99–1.00)	<0.001
NLPR	1.1[0.8, 1.8]	0.9[0.7, 1.4]	N/A	<0.001‡	1.15 (1.09–1.22)	<0.001
Post-surgery (within 1 h of arrival in ICU)
Leukocyte (109/L)	12.7 ± 3.8	12.2 ± 3.5	−3.382	<0.001†	1.05 (1.03–1.08)	<0.001
Neutrophil (109/L)	10.9 ± 3.5	10.5 ± 3.3	−3.046	0.002†	1.05 (1.03–1.08)	<0.001
Lymphocyte (109/L)	0.8 ± 0.4	0.8 ± 0.4	1.200	0.231†	0.88 (0.91–1.09)	0.232
Platelet (109/L)	137.0 ± 55.0	150.7 ± 55.3	5.800	<0.001†	0.99 (0.99–1.00)	<0.001
NLPR	12.4[7.5, 20.0]	10.6[6.4, 16.7]	N/A	<0.001‡	1.02 (1.02–1.03)	<0.001

^aOR was adjusted by age, gender, and body mass index.

^†Refers to Student’s t test (for continuous variables which were normally distributed).

^‡Refers to Wilcoxon test (for continuous variables which were non-normally distributed).

AKI: acute kidney injury; aOR: adjusted odds ratio; ICU: intensive care unit；NLPR: neutrophil-to-platelet*lymphocyte ratio.