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Seropositivity for H pylori and HAV in the study population, Salvador, Brazil, 2001-2002.
| Age group (in yr) | Number of subjects | Seropositive for H pylori n (%) | Seropositive for HAV n (%) |
| 1-3 | 43 | 12 (27.9) | 7 (16.3) |
| 4-6 | 50 | 25 (50.0) | 19 (38.0) |
| 7-9 | 16 | 7 (43.8) | 12 (75.0) |
| 10-12 | 12 | 7 (58.3) | 7 (58.3) |
| Total | 121 | 51 (42.2) | 45 (37.2) |
χ2 for linear trend: 4.01 (P = 0.045) and 16.07 (P<10-4) for age in the H pylori and HAV groups, respectively.
