Table 1

Comparison of IgG seropositivity rates in cases and controls according to age groups

CasesControlsp Value
Subjects testedSeropositiveSubjects testedSeropositive
NN%NN%
Age groups
 ≤40 years21506000.25
 41–60 years1218.32214.51.00
 61–80 years4149.81441711.81.00
 >80 years1000233130.53