Table 1.
Prevalence of HAV antibodies according to individual and household-level risk factors
| 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 | |
Ramal do Granada, Brazil, 2004.
aNumber of individuals differ for some variables, because of missing values.
b Pvalues forχ2 tests for linear trend; all other P values are for standard χ2 tests.
cWealth index derived from information on household assets and other socioeconomic data; see the “Subjects, Methods” section.
95% CI, 95% confidence interval.