(B) Inflammatory response and coagulation function of the aging patients with COVID-19.

Study	C-reactive protein (mg/L)		Interleukin-6 increased, n (%)		Procalcitonin increased, n (%)		Platelets (× 10 9/L)		D-dimer increased, n (%)
	Older	Younger	Older	Younger	Older	Younger	Older	Younger	Older	Younger
Zhao et al.	50.37 ± 55.31	21.13 ± 31.22	NA	NA	49 (9.30%)	13 (2.75%)	196.60 ± 84.14	213.00 ± 72.87	NA	NA
Liu et al.	23.63 ± 17.29	8.45 ± 12.59	NA	NA	NA	NA	217.67 ± 102.97	227.33 ± 82.43	NA	NA
Chen et al.	123.77 ± 214.68	111.33 ± 219.35	22 (40.00%)	22 (14.86%)	5 (9.09%)	2 (1.35%)	199.33 ± 298.42	234.00 ± 395.29	19 (34.55%)	7 (4.73%)
Lian et al.	23.10 ± 29.30	8.55 ± 11.07	NA	NA	NA	NA	169.67 ± 56.57	186.33 ± 52.75	NA	NA