Table 3

Incidence of hospitalisation with severe complications per 100 000 confirmed influenza infections

Inpatients per 100 000 influenza infections, nHospitalisationAny of five complicationsAcute respiratory failurePneumoniaARDSFebrile seizureEncephalitis/encephalopathy
Sex*p<0.0001p<0.0001p<0.0001p<0.0001p=0.08p<0.0001p=0.08
Male (n=8 885 794)97019122.21710.1517.80.8
Female (n=7 751 279)101117117.81560.0613.21.1
Year†p<0.0001p<0.0001p=0.07p<0.0001p=0.98p<0.0001p=0.19
January 2012–August 2012 (n=1 611 699)1114249232290.25230.4
September 2012–August 2013 (n=2 912 806)1079199221800.07170.8
September 2013–August 2014 (n=3 532 559)1023180201600.06171.3
September 2014–August 2015 (n=3 628 976)965169191500.17141.1
September 2015–August 2016 (n=3 530 057)951172211570.06140.7
September 2016–December 2016 (n=1 103 073)946166201520.18111.4
Age, years
0–1 (n=823 875)25519431018470.731211.3
2–5 (n=2 886 462)776307262790450.9
6–12 (n=4 193 137)52612410115071.3
13–18 (n=1 480 030)734879.47800.411.4
19–44 (n=3 815 970)133710015880.050.180.9
45–64 (n=2 872 125)11419518820.2100.5
65–74 (n=231 120)1919271562451.700.4
  • *p for difference of incidence.

  • p for trend.

  • ARDS, acute respiratory distress syndrome.