highly significantp < 0.001
By contrast to 2000, the differences in seroprevalence between age groups for any given year were highly significant (p < 0.001).
By contrast to 2000, the differences in seroprevalence between age groups for any given year were highly significant (p < 0.001).
Secondly, in the intermediate age group (7–15 years), besides a slightly non-significant increase of antibody responses from 2002 to 2008 (p = 0.92), the overall profile was similar to that observed with the younger age group though reactivity was observed in 2012 in the intermediate group (Fig. 2 b).