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Table 4 Prevention measures related to the seroprevalence of IgG anti-SARS-CoV-2 antibodies

From: Migration in times of pandemic: SARS-CoV-2 infection among the Warao indigenous refugees in Belém, Pará, Amazonia, Brazil

Prevention measures for SARS-CoV-2

Total

n = 94

%

Positive

n = 84

%

Negative

n = 10

%

OR

IC 95%

p-values

Wore a mask while distancing

Yes

92

97.9

82

97.6

10

100.0

7.63

0.0 - *

1.000

No

2

2.1

2

2.4

0

0.0

Ref.

  

How often do you wear a mask?

Sometimes

73

77.7

66

78.6

7

70.0

1.82

0.39–8.46

0.444

Always

19

20.2

16

19.0

3

30.0

Ref.

  

Never

2

2.1

2

2.4

0

0.0

6.47232E+ 08

0.0 - a

0.999

Wore mask when on the street?

Rarely

3

3.2

3

3.6

0

0.0

76,472,871.59

0.0 - a

0.999

Sometimes

6

6.4

6

7.1

0

0.0

3.60610E+ 08

0.0 - a

0.999

Always

82

87.2

72

85.7

10

100.0

Ref.

  

Never

3

3.2

3

3.6

0

0,0

7.57779E+ 08

0.0 - a

0.999

Do you wash your hands with soap?

Only sometimes

39

41.5

38

45.2

1

10.0

7.51

0.90–62.70

0.063

Many times a day

51

54.3

42

50.0

9

90.0

Ref.

  

Rarely

4

4.3

4

4.8

0

0.0

1.76719E+ 08

0.0 - a

0.999

  1. a number tends to infinity; OR: Odds ratio (adjusted)