Table 1.
Participation to Influweb during the three seasons under study.
Fig 1.
Geographic distribution of the Influweb active participants, the Influnet sample and the Italian population.
The color code indicates the proportion of the population living in the Italian regions. The maps were created by manipulating publicly available shapefile at the region level.
Table 2.
Age, gender and household composition of the Influweb population compared to the general population.
Fig 2.
Influweb age and gender distributions.
Age and gender distributions of the Influweb active participants in comparison with the Italian population for the 2014–2015 influenza season.
Table 3.
Influweb and Influnet vaccination coverage.
Fig 3.
Influweb and Influnet vaccination rate for 65+ years old.
Fig 4.
Incidence rates among the Influweb active participants in comparison with the Influnet incidence curve.
For ease of comparison, the curves are reported on different scales.
Fig 5.
Cross-correlation between the smoothed time series for Influweb data and the Influnet curve.
(A), (C), (E) show the incidence curves for Influnet and the smoothed one for Influweb. (B), (D), (F) show the cross-correlation as a function of the lag (weeks) between the two time series.
Fig 6.
Proportion of volunteers reporting ILI symptoms who sought healthcare assistance or consultation during the three influenza seasons under study.
Fig 7.
Age distribution of the proportion of participants seeking medical service during ILI episode.
Fig 8.
Age distribution of the proportion of participants who changed their daily routine during ILI episode.
Table 4.
Estimates of the Influenza Attack Rate in different age groups in Italy.