Table 4.

Correlation of clinical variables with anti-spike antibody levels in post-COVID-19 (non-vaccinated and single-dose and two-dose vaccinated) and COVID-19-naïve two-dose vaccinated KTRs

	Post-COVID-19 KTRs
	Non-vaccinated		Single-dose vaccinated		Two-dose vaccinated		COVID-19-naïve two-dose vaccinated
Variables	Spearman's correlation	P-value	Spearman's correlation	P-value	Spearman's correlation	P-value	Spearman's correlation	P-value
Age (years)	0.037	.788	0.445	0.064	–0.380	0.038	–0.107	0.281
Transplant duration up to vaccination date (weeks)	NA	NA	0.303	0.222	–0.072	0.706	0.158	0.11
Duration from onset of COVID-19 to vaccination date (weeks)	NA	NA	0.395	0.104	0.015	0.938	NA	NA
Days from last dose of vaccine	NA	NA	0.061	0.810	–0.068	0.720	–0.160	0.107

Bold value represent the statistically significant value. The italic has no significance.