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Table 2 Number of hospitalizations coded as due to influenza by age group and epidemic season per 100,000 people in Portuguese public hospitals between 2008/2009 and 2017/2018

From: Excess hospitalizations and mortality associated with seasonal influenza in Portugal, 2008–2018

Season

Age groups (in years)

0–4

5–18

19–49

50–64

65–74

 ≥ 75

 ≥ 65

All ages

2008/2009

22.8

2.3

1.3

2.2

4.8

10.4

7.5

3.8

2009/2010

123.5

27.8

23.6

19.4

14.2

12.1

13.2

26.2

2010/2011

32.2

3.7

5.2

8.1

6.6

8.3

7.4

7.2

2011/2012

26.6

1.7

1.8

2.4

6.5

13.5

9.9

4.6

2012/2013

26.3

3.7

4.5

9.0

8.1

11.0

9.6

7.3

2013/2014

40.0

2.9

5.5

10.0

10.1

16.4

13.2

9.1

2014/2015

35.3

4.7

3.8

7.2

14.2

25.0

19.5

9.2

2015/2016

79.4

6.1

7.3

17.9

21.5

25.8

23.6

15.7

2016/2017

39.9

3.8

3.6

12.2

28.2

91.6

58.9

18.8

2017/2018

77.4

9.2

6.3

22.2

42.5

121.4

80.7

29.3

9-year meana

41.3

4.2

4.3

10.2

16.3

37.3

26.5

11.6

3-year meanb

65.6

6.3

5.7

17.5

30.8

80.0

54.7

21.3

  1. aIncludes the following seasons: 2008/2009, 2010/2011, 2011/2012, 2012/2013, 2013/2014, 2014/2015, 2015/2016, 2016/2017, 2017/2018. Excludes season 2009/10, since it was affected by the 2009 influenza A (H1N1) pandemic
  2. bIncludes the most recent seasons, namely 2015/2016, 2016/2017, 2017/2018