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Table 1 Participation and influenza-like-illness (ILI) cases reported per season from 2012/13 to 2017/18, GrippeNet.fr

From: Factors associated with influenza-like-illness: a crowdsourced cohort study from 2012/13 to 2017/18

  2012/13 2013/14 2014/15 2015/16 2016/17 2017/18
Epidemic periods (starting week-ending week; number of epidemic weeks)a 2012w51-2013w11 (13 weeks) 2014w05-2014w09 (5 weeks) 2015w03-2015w11 (9 weeks) 2016w04-2016w14 (11 weeks) 2016w50-2017w05 (8 weeks) 2017w50-2018w10 (13 weeks)
GN registered individualsb, N 6046 5907 6632 6515 6234 5958
GN participants included in the studyc, n (%) 2943 (49%) 4140 (70%) 4428 (67%) 4780 (73%) 4204 (67%) 4158 (70%)
Symptoms surveys filled in by the included participants, N 58,235 76,578 80,106 99,333 73,711 82,252
Included participants having at least one ILI episode during the epidemic period (ILIECDC definition), n (%) 866 (29%) 469 (11%) 886 (20%) 829 (17%) 787 (19%) 855 (21%)
Included participants having at least one ILI episode during the epidemic period (GNILI- definition), n (%) 231 (8%) 111 (3%) 251 (6%) 203 (4%) 174 (4%) 198 (5%)
  1. GN GrippeNet.fr
  2. aEpidemic periods defined by the French Sentinelles network (available on http://www.sentiweb.fr/?page=epidemies)
  3. bAny GN participants having filled in at least one profile survey
  4. cAny GN participants having filled in at least three symptoms surveys (one before, one during and one after the influenza epidemic period)