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Table 1 Characteristics of the participants of two population-based dengue serosurveys, Central Brazil, 2001–2002

From: Spatial point analysis based on dengue surveys at household level in central Brazil

Characteristics 2001 Survey (n = 1,586) 2002 Survey (n = 2,906)
  No % No %
Gender:     
   Female 1,066 67.2 1,967 67.7
   Male 520 32.8 939 32.3
Age (years):     
   5–14 63 4.0 133 4.6
   15–49 1,084 68.3 1,969 67.8
   ≥ 50 438 27.6 794 27.3
   Unknown 1 0.1 10 0.3
Educational Level     
   Illiterate 99 6.2 182 6.3
   Elementary school 920 58.0 1,643 56.5
   High school 423 26.7 793 27.3
   College 133 8.4 268 9.2
   Unknown 11 0.7 20 0.7
Yellow fever vaccination history     
   Yes 1,451 91.5 2,706 93.1
   No 89 5.6 126 4.3
   Unknown 46 2.9 74 2.5
Seropositives* 506 29.5† 1,144 37.3†
  1. * Seropositive refers to IgM/IgG positive results for dengue virus infections.
  2. † p < 0.01 (two sided; χ2 test statistic comparing 2001 and 2002 serosurveys)