Fig. 1

Recruitment campaigns and respondent population description. (A) Number of participants, epidemiological situations, enforced mitigation measures, vaccination coverage, and school holiday for each campaign. On the top panel, each plot represents the number of answers for each of the campaigns. For each day (x-axis), the bars represent the number of answers collected, with colours indicating whether the day when the contacts were declared (previous day) was a weekday or a weekend. The dashed lines represent the beginning date of a campaign. On the bottom panel, the black line represents the number of daily new hospitalizations (data from [31]) and the orange line represents the cumulative percentage of the French population that received at least one dose [32]. The horizontal bars below represent the periods corresponding to each dominant variant in France, the curfews and lockdowns as well as the periods when children from at least one zone were on holiday. (B) Comparison between the age distribution of respondents for each campaign (coloured bars) and the age distribution of the French population (grey bars) reported by the INSEE. (C) Distribution of respondents by gender for each recruitment campaign