Observed vs predicted VZV seroprevalence rates for Slovenian data (predictions generated by the parametric model; see text). Observed rates are shown in black dots along with 95% binomial confidence intervals. The numbers below/above the CI lines represent the total number of subjects in each age group. Proportions of seropositives predicted by the model are shown in solid line. The dashed line is the model-derived force of infection curve (the corresponding scale is on the right; λmax 0.282 at 5.0 years).