Table 6.

Correlation between the levels of LDH and leukocyte counts in patients with COVID-19 pneumonia.

Variables	At admission		At discharge
	r	p	r	p
CD3+ lymphocytes, ×106/l
Total	−0.4424	<0.0001****	−0.2113	0.0020**
Non-severe	−0.3543	<0.0001****	−0.2108	0.0045**
Severe	−0.5787	<0.0001****	0.1945	0.2861
CD4+CD3+ lymphocytes, ×106/l
Total	−0.4121	<0.0001****	−0.2139	0.0017**
Non-severe	−0.3128	<0.0001****	−0.2106	0.0044**
Severe	−0.5624	<0.0001****	0.1943	0.2866
CD8+CD3+ lymphocytes, ×106/l
Total	−0.3910	<0.0001****	−0.2148	0.0018**
Non-severe	−0.3054	<0.0001****	−0.1978	0.0079**
Severe	−0.5319	<0.0001****	−0.1195	0.5370
NLR
Total	0.3972	<0.0001****	0.2557	<0.0001****
Non-severe	0.2835	<0.0001****	0.2260	0.0001***
Severe	0.6588	<0.0001****	0.2525	0.0868
Neutrophil count, ×109/l
Total	0.1673	0.0013**	0.1459	0.0057**
Non-severe	0.0741	0.1878	0.1414	0.0125*
Severe	0.5454	<0.0001****	0.2619	0.0753
TLC, ×109/l
Total	−0.3996	<0.0001****	−0.1921	0.0003***
Non-severe	−0.3161	<0.0001****	−0.1394	0.0139*
Severe	−0.4688	<0.0001****	−0.1496	0.3154
CRP, mg/l
Total	0.5966	<0.0001****	0.2669	<0.0001****
Non-severe	0.5393	<0.0001****	0.2459	<0.0001****
Severe	0.5898	<0.0001****	0.3560	0.0223*

^*p < 0.05, ^**p < 0.01, ^***p < 0.001, ^****p < 0.0001.

C3, complement 3; C4, complement 4; CD4+/CD8+, the ratio of CD4+ lymphocyte counts to CD8+ lymphocyte counts; COVID-19, coronavirus disease 2019; CRP, C-reactive protein; Ig, immunoglobulin; LDH, lactate dehydrogenase; NLR, neutrophil-to-lymphocyte ratio; r, correlation coefficient; TLC, total lymphocyte count.