Table 2 Seroconversion and clinical endpoints
Exposure to waste water
NoYes
Seroconversion/person-year
    Hepatitis E0.010.01
    Helicobacter pylori IgG0.100.11
    Helicobacter pylori IgA0.180.15
Incidence of clinical endpoints (person-years)*
    Peptic ulcer00.0008
    Gastritis0.0050.002
    Eradication0.0080.002
  • *The absolute number of cases was 0 and 1 for peptic ulcers, 7 and 2 for gastritis, and 12 and 3 for eradication in non-exposed and exposed workers, respectively (p>0.1; Fisher’s exact test). Seven workers were diagnosed with both gastritis and eradication.