Table 2.

Summary of meta-analysis results.

Comparison	P value	WMD (pg/mL)	95% CI (pg/mL)	I2	Number of studies for estimation
Severe vs non-severe	0.04	96.63	0.88–19.38	99.9	13
Uncomplicated vs controls	< 0.001	42.86	30.17–55.56	100	17
Uncomplicated vs asymptomatic	0.063	42.07	− 2.23–86.37	99.1	8
Asymptomatic vs healthy controls	0.45	1.67	− 2.73–6.07	98.1	2
Died vs survived	0.007	1399.19	384.16–2414.2	93.1	4

WMD weighted mean difference, CI confidence interval.