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Table 3 The influenza peak weeks for each age-group. Here, we record Wednesday of that week. Except for the 2011–12 season when the height of the second peak of 5–19 age-group in the bimodal peak was higher than that of the first peak, the 5–19 age-group peaks earlier than the other age-group

From: Early detection of influenza outbreak using time derivative of incidence

  2009–10 2010–11 2011–12 2012–13 2013–14 2014–15 2015–16
0–4 2009-11-11 2010-12-29 2012-02-08 2013-02-27 2014-02-19 2015-02-18 2016-02-10
5–19 2009-10-28 2010-12-22 2012-03-28 2013-02-20 2014-02-12 2015-02-11 2016-02-03
20–64 2009-11-11 2010-12-29 2012-02-15 2013-02-20 2014-02-19 2015-02-18 2016-02-10
65+ 2009-11-04 2011-01-05 2012-02-15 2013-02-27 2014-02-19 2015-02-18 2016-02-17