Table 1.

Characteristics of our cohort

Baseline	All	Vaccinated	Not vaccinated	P
n (%)	132 (100)	101 (77)	31 (23)	—
Age, yr	67.54 ± 15.71	68.89 ± 14.86	63.13 ± 17.74	0.0739
Male, n (%)	75 (57)	60 (59)	15 (48)	0.3054
Dialysis vintage, yr	2.21 [0.80–4.68]	2.28 [0.81–4.58]	2.21 [0.41–5.97]	0.5637
Charlson Comorbidity Index	8 [5–10]	8 [5–10]	8 [6–9]	0.3649

T1	Responders	Nonresponders	P
No.	35	60	—
Age, yr	62.31 ± 16.20	73.72 ± 11.18	0.0001
Male, n (%)	20 (57)	35 (58)	0.9999
Dialysis vintage, yr	1.44 [0.67–3.97]	2.99 [0.96–5.99]	0.3149
Charlson Comorbidity Index	6 [4–8]	9 [7–10]	0.0006
Anti–SARS-CoV-2 S IgG titer, U/ml	8.22 [1.73–28.70]	—	—

S, spike; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2; T1, time of the second vaccine injection.

Age is expressed as mean ± SD; dialysis vintage and Charlson Comorbidity Index are expressed as median [interquartile range].

Bold P values indicate statistically significant variables.