Test for two additional determinants on vaccination decision-making: influenza prevalence and influenza exposure, results from multilevel logistic regressions.

*<p>P<0.05, ^**P<0.01, ^***P<0.001</p>a<p>No formal statistical test was conducted to test if the random effect equals to zero.</p><p>Observations from Round 2 to Round 24 were used for the analysis. The random effect at the group level was not shown as it was estimated as zero.