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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)