Fig. 4

Mean values of willingness to vaccinate (both with regard to one’s child as to oneself) and results from the multilevel analyses*, in parents (of teenagers (T) and other children (O)) and individuals with no under-age children (NC) on the one hand, and in parents (T) and parents (O) separately. * Tables with the descriptive analyses (means and standard deviations) and the results from the multilevel analyses are shown in Supplementary file 4. Multilevel results shown in this figure are the significant (p < 0.05) changes in willingness to vaccinate between the consecutive waves and the significant overall differences between groups. There were no significant (p < 0.05) differences in slopes between groups. ** Only assessed among parents. *** During wave 3, only 13 parents (T) answered the question of vaccination intention for their child because the majority of the respondents indicated that their child had already received the menACWY vaccination