Table 2.

Relationship between participant characteristics and vaccination responses.

		Number of patients (n = 646)	Antibody titer of post-vaccine samples, AU/mL (mean ± SD)
Sex
	Male	184	13,434.7 ± 8,849.0	p < 0.001
	Female	462	16,272.0 ± 9,721.2
Age
	Young (≤45 y)	344	16,562.1 ± 9,745.1	p = 0.002
	Aged (>45 y)	302	14,212.9 ± 9,203.1
Systemic steroid use
	No	639	15,535.8 ± 9,533.2	p = 0.068
	Yes	7	8,899.1 ± 10,549.4
Other immunosuppressant use
	No	635	15,526.0 ± 9,459.6	p = 0.423
	Yes	11	11,879.0 ± 14,417.2
History of immunodeficiency
	No	645	15,472.6 ± 9,565.3	P = 0.555
	Yes	1	9,815.8
History of malignancy
	No	634	15,362.9 ± 9,377.5	P = 0.051
	Yes	12	20,795.1 ± 16,356.6
History of autoimmune diseases
	No	629	15,504.9 ± 9,521.6	P = 0.508
	Yes	17	13,946.3 ± 11,124.2
History of diabetes
	No	642	15,465.9 ± 9,574.9	P = 0.938
	Yes	4	15,139.9 ± 7,651.7
History of COVID-19
	No	636	15,350.8 ± 9,465.4	P = 0.051
	Yes	9	24,644.5 ± 12,151.1
History of COVID-19-like illness
	No	585	15,389.6 ± 9,563.2	P = 0.453
	Yes	60	16,365.9 ± 9,548.4
History of close contact with COVID-19 patients
	No	627	15,384.8 ± 9,527.5	P = 0.181
	Yes	18	18,813.0 ± 10,321.5