Table 1.

Comparison^* of demographic characteristics of all participants whose serum and dried blood spot samples were tested by SARS-CoV-2 IgG ELISA

Demographic Characteristics	Participants Whose Sera Were Positive for SARS-CoV-2 IgG by ELISA (N = 100)	Participants Whose Sera Were Negative for SARS-CoV-2 IgG by ELISA (N = 194)	P-Value
Sex
Male, n (%)	31 (31.0)	93 (47.9)	0.005
Female, n (%)	69 (69.0)	101 (52.1)
Age (in years)
Mean (SD)	36.1 (11.20)	10.8 (1.51)	<0.0001
Median (IQR)	33 (18)	11 (3)

IQR = interquartile range.

^*We used the t-test for continuous variables (age) and χ² test for categorical variables (sex).