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Table 1 Prevalence of HAV antibodies according to individual and household-level risk factors

From: Hepatitis A and E seroprevalence and associated risk factors: a community-based cross-sectional survey in rural Amazonia

Variable No. of subjectsa HAV antibody prevalence (%) Odds ratio (95% CI) P
Age (years)
  5-10 69 46.4 1.00 <0.0001b
  11-20 111 80.2 4.68 (2.28-9.61)  
  21-30 67 95.5 24.67 (6.84-131.24)  
  31-50 103 97.1 38.54 (10.82-203.18)  
  >50 47 93.6 16.96 (4.63-91.28)  
Sex
  Female 190 84.7 1.29 (0.74-2.26) 0.417
  Male 207 81.1 1.00  
Past history of hepatitis
  No 345 81.4 1.00 0.082
  Yes 52 93.2 2.73 (0.95-10.79)  
Education of household head (years of schooling)
  0 81 87.6 2.12 (0.76-6.01) 0.418b
  1-4 186 77.4 1.20 (0.52-2.63)  
  5-8 84 88.1 2.22 (0.80-6.26)  
  >8 52 76.9 1.00  
Wealth index (quartiles)c
  1 (poorest) 112 83.0 1.06 (0.47-2.39) 0.973b
  2 101 82.2 1.00 (0.44-2.28)  
  3 100 84.0 1.14 (0.49-2.66)  
  4 (least poor) 84 82.1 1.00  
Water source
  Well 375 82.4 1.00 0.462
  River/stream 22 90.9 2.14 (0.50-19.27)  
Drinking water filtrated or chlorinated
  Yes 308 83.4 1.00 0.523
  No 73 79.4 0.77 (0.39-1.58)  
Crowding (number of inhabitants/room)
  <1 168 86.9 1.00 0.930b
  1-1.9 187 77.5 0.52 (0.28-0.94)  
  2-3 18 77.8 0.53 (0.15-2.41)  
  >3 24 100 Not calculable  
  1. Ramal do Granada, Brazil, 2004.
  2. aNumber of individuals differ for some variables, because of missing values.
  3. b Pvalues forχ2 tests for linear trend; all other P values are for standard χ2 tests.
  4. cWealth index derived from information on household assets and other socioeconomic data; see the “Subjects, Methods” section.
  5. 95% CI, 95% confidence interval.