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. 2020 Oct 29;44:e135. doi: 10.26633/RPSP.2020.135

TABLE 3. Prevalence and prevalence ratio of antibodies against SARS-CoV-2 according to socioeconomic and demographic characteristics, stratified by region of the country.

 

Results by region of the country

North

Northeast

Southeast/South/Center-West

N

Positive samples

Unadjusted prevalence ratio (95% CI)

N

Positive samples

Unadjusted prevalence ratio (95% CI)

N

Positive samples

Unadjusted prevalence ratio (95% CI)

 

N

%

 

N

%

 

N

%

Wealth quintiles

 

p=0.03b

 

 

p=0.004b

 

 

 

p=0.38c

 

 Poorest

4 985

355

7.1

1.37 (1.11; 1.68)

7 788

231

3.0

1.59 (1.21; 2.08)

8 203

35

0.4

1.07 (0.68; 1.68)

 2nd

3 243

218

6.7

1.29 (1.03; 1.61)

5 772

194

3.4

1.80 (1.35; 2.39)

7 545

37

0.5

1.23 (0.80; 1.88)

 3rd

2 820

184

6.5

1.25 (1.02; 1.54)

5 262

156

3.0

1.59 (1.19; 2.12)

9 243

49

0.5

1.33 (0.88; 2.01)

 4th

2 577

184

7.1

1.37 (1.09; 1.72)

4 404

128

2.9

1.55 (1.16; 2.08)

10 281

57

0.6

1.39 (0.96; 2.01)

 Richest

2 379

124

5.2

Reference (1)

3 583

67

1.9

Reference (1)

11 268

45

0.4

Reference (1)

Schooling (yr)a

 

 

p=0.01b

 

 

 

p<0.001b

 

 

 

p=0.002c

 

≤ 4

2 167

159

7.3

1.32 (1.05; 1.66)

4 581

139

3.0

1.70 (1.29; 2.23)

7 380

28

0.4

1.19 (0.70; 2.04)

5 – 8

2 020

157

7.8

1.40 (1.12; 1.75)

3 859

149

3.9

2.16 (1.63; 2.95)

7 329

41

0.6

1.76 (1.08; 2.85)

9 – 11

5 393

375

7.0

1.25 (1.04; 1.50)

8 782

256

2.9

1.63 (1.27; 2.10)

14 140

91

0.6

2.02 (1.34; 3.04)

≥ 12

2 682

149

5.6

Reference (1)

3 969

71

1.8

Reference (1)

10 362

33

0.3

Reference (1)

Color/ethnicity

 

 

p<0.001c

 

 

 

p<0.01c

 

 

 

p<0.002*

 

 White

2 729

133

4.9

Reference (1)

6 418

158

2.5

Reference (1)

23 236

81

0.4

Reference (1)

 Brown

10 052

730

7.3

1.49 (1.26; 1.76)

14 048

410

3.0

1.21 (0.95; 1.54)

4 950

35

0.7

2.03 (1.33;3.09)

 Black

1 954

116

5.9

1.22 (0.98; 1.51)

4 400

131

3.0

1.21 (0.95; 1.54)

4 950

35

0.7

2.03 (1.33;3.09)

 Asian

524

20

3.8

0.78 (0.50; 1.22)

838

27

3.2

1.31 (0.86; 2.00)

1 084

5

0.5

1.32 (0.54; 3.24)

 Indigenous

400

42

10.5

2.15 (1.58; 2.93)

393

22

5.6

2.27 (1.44; 3.60)

426

2

0.5

1.35 (0.33; 5.47)

Source: prepared by authors from the results.

a

Subjects < 20 years were excluded as most were still at school.

b

test for linear trend

c

test for heterogeneity