Efficacy of COVID-19 Convalescent Plasma Based on Antibody Concentration

Table 3

Means and medians for survival time for the nucleocapsid protein domain.

	Mean estimate	Std. error	95% confidence interval		Median estimate	Std. error	95% confidence interval
			Lower bound	Upper bound			Lower bound	Upper bound
Nucleocapsid IgG low—21.17 μg/ml	37.709	4.617	28.660	46.758	.	.	.	.
Nucleocapsid IgG 21.18 μg/ml- high	25.285	2.707	19.979	30.591	26.000	5.961	14.317	37.683
Overall	35.328	3.445	28.576	42.081	29.000	.	.	.
			Chi-square		Df		Sig.
Log rank (Mantel-Cox)			0.258		1		0.612

Estimation is limited to the largest survival time if it is censored. Test of equality of survival distributions for the different levels of nucleocapsid IgG.