Table 2 Sociodemographic factors associated with seropositivity to antibodies anti SARS-CoV-2 in Mexico, 2020. Multivariable Poisson regression modelsa.

From: Nationally representative SARS-CoV-2 antibody prevalence estimates after the first epidemic wave in Mexico

 

Children and adolescents

Adults

 

PR % (95% CI)

p-value

PR % (95% CI)

p-value

Age group (years)

   1–9

REF

   

   10–19

1.21 (0.97, 1.51)

0.097

  

   20–29

  

REF

 

   30–39

  

0.94 (0.81, 1.09)

0.421

   40–49

  

0.99 (0.85, 1.15)

0.873

   50–59

  

0.87 (0.73, 1.03)

0.103

   60–69

  

0.77 (0.62, 0.96)

0.018

   70+

  

0.54 (0.42, 0.70)

<0.001

Sex

   Male

REF

 

REF

 

   Female

1.01 (0.81, 1.26)

0.956

1.00 (0.90, 1.10)

0.946

Education

   Graduate/postgraduate

  

REF

 

    High school

  

1.23 (1.04, 1.45)

0.017

    Middle school

  

1.32 (1.11, 1.57)

0.002

   Elementary school or less

  

1.30 (1.08, 1.57)

0.006

Urbanization

   Rural

REF

 

REF

 

   Urban

1.42 (0.96, 2.10)

0.077

1.34 (1.09, 1.66)

0.006

   Metropolitan

1.43 (0.94, 2.18)

0.091

1.46 (1.18, 1.81)

0.001

Employment status

   Unemployed

  

REF

 

    Student

  

0.90 (0.64, 1.27)

0.549

    Retired

  

1.00 (0.75, 1.34)

0.997

   Formal workerb

  

1.29 (1.11, 1.51)

0.001

   Informal worker

  

1.13 (0.99, 1.28)

0.066

Socioeconomic level

   High

REF

 

REF

 

   Medium

0.93 (0.67, 1.29)

0.646

1.11 (0.96, 1.29)

0.147

   Low

1.15 (0.78, 1.69)

0.484

1.20 (1.01, 1.42)

0.037

  1. PR prevalence ratio, REF reference group, CI confidence interval.
  2. aBoth multivariable regression models were adjusted by region and the covariates listed in the table. A two-sided F test was used to evaluate the overall model and a two-sided T test for each variable in the model. Degrees of freedom=6.
  3. bWorker with access to social security services or private medical insurance.
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