Table 2 Infection-related biomarkers and Lymphocyte subgroup of patients with COVID-19 in different clinical types.

	Mild (n = 10)		General (n = 32)		Severe (n = 8)		Critical (n = 15)		P
	Mean	SD	Mean	SD	Mean	SD	Mean	SD	P
Infection-related biomarkers
IL-6 (pg/ml)	5.36^a	1.84	13.76^a	9.07	15.94^a	14.88	33.21	28.58	0.0003
ESR (mm/h)	8.75^abc	8.66	29.38^ad	21.76	33.38^d	27.32	50.21^cd	48.00	0.0008
Serum ferritin (ng/ml)	148.22^a	196.53	396.02	260.29	469.53	188.18	1,005.16^bcd	577.32	< 0.0001
CRP (mg/l)	7.79^a	10.88	12.79^ac	7.70	17.84^a	15.09	46.75^bd	37.66	< 0.0001
Lymphcyte subgroup
Total (n/μl)	1,810.57^abc	730.95	1,266.27^abd	432.62	902.5^cd	441.84	512.8^cd	299.52	< 0.0001
T (n/μl)	1,194.29^abc	400.10	857.74^abd	283.59	582.25^acd	305.80	278.27^bcd	122.85	< 0.0001
CD4 (n/μl)	685.71^abc	237.23	454.16^ad	193.24	317.63^ad	162.30	139^bcd	87.86	< 0.0001
CD8 (n/μl)	475.86^ab	159.60	385.74^ab	142.82	237.63^cd	168.54	134.13^cd	74.90	< 0.0001
B (n/μl)	254.57^ab	196.68	175.47^a	100.13	127.88^d	81.13	97.73^cd	76.76	0.0133
NK (n/μl)	317.86^a	245.90	201.23	215.58	165.88	173.58	117	137.44	0.171

COVID-19 Corona Virus Disease 2019, IL-6 Interleukin-6, ESR erythrocyte sedimentation rate, CRP, C-reactive protein.
^aCompared to critical type, P < 0.05.
^bCompared to severe type, P < 0.05.
^cCompared to general type, P < 0.05.
^dCompared to mild type, P < 0.05.

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