TABLE 3—

Combined Seroprevalence of SARS-CoV-2 According to Gender, Age, Skin Color, and Schooling: The State of Rio Grande do Sul, Brazil, April 11 to September 6, 2020

Variables	Seroprevalence,a % (95% CI)	P
Gender		.35
Male	0.54 (0.43, 0.67)
Female	0.61 (0.51, 0.73)
Age, y		.028
0–19	0.63 (0.38, 0.99)
20–39	0.61 (0.46, 0.79)
40–59	0.70 (0.56, 0.87)
≥ 60	0.41 (0.30, 0.55)
Skin color		.65
White	0.55 (0.46, 0.65)
Brown	0.68 (0.48, 0.93)
Black	0.65 (0.36, 1.08)
Schooling		.005
Primary or less	0.45 (0.34, 0.58)
Secondary	0.76 (0.60, 0.94)
University or higher	0.56 (0.43, 0.71)

Note. CI = confidence interval; SARS-CoV-2 = severe acute respiratory syndrome coronavirus 2.

^aCombined seroprevalence: number of positive tests across the 8 rounds divided by the number of tests performed across the 8 rounds.