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Table 2 Summary of the Characteristics of the Hospitalizations With a Diagnosis of Influenza by Age Group and Presence of Comorbidities in Spanish Public Hospitals Between 2008/2009 and 2017/2018

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

Variable

Age group (in years)

With comorbidities

Without comorbidities

0–4

5–18

19–49

50–64

65–74

 ≥ 75

 ≥ 65

All Ages

 < 65

 ≥ 65

 < 65

 ≥ 65

Share of hospitalizations (%)

9 years meana

10.9

4.2

11.7

16.6

16.4

40.3

56.7

100.0

18.9

40.1

24.4

16.5

3 years meanb

8.3

3.7

9.9

16.1

17.4

44.6

62.1

100.0

16.0

40.3

22.0

21.8

[Min; Max]c

[5.0; 37.3]

[2.4; 11.5]

[6.4; 38.6]

[11.5; 21.4]

[7.5; 18.1]

[10.1; 58.3]

[17.7; 74.3]

100.0

[8.6; 35.6]

[15.5; 67.4]

[11; 55.1]

[2.1; 41.8]

LoS (in days)

9 years meana

6.1

6.2

10.2

11.7

11.0

9.3

9.8

9.4

12.0

10.1

6.9

8.8

3 years meanb

5.7

5.5

8.8

10.6

9.7

8.8

9.1

8.8

10.8

9.4

6.5

8.4

[Min; Max]c

[5.1; 7.0]

[4.6; 7.4]

[6.0; 14.8]

[7.8; 14.8]

[7.4; 12.8]

[7.7; 10.7]

[7.9; 11.1]

[6.6; 11.4]

[7.1; 15.1]

[8; 11.3]

[4.9; 9.2]

[6; 11.3]

In-hospital case fatality risk (%)

9 years meana

0.3

0.7

2.9

5.0

5.1

7.8

7.0

5.2

4.5

7.1

1.6

6.7

3 years meanb

0.3

0.6

2.6

4.7

4.7

7.7

6.9

5.3

4.4

7.0

1.6

6.8

[Min; Max]c

[0.1; 0.5]

[0.0; 1.4]

[0.4; 4.4]

[2.2; 7.1]

[3.8; 8]

[3.6; 9.3]

[3.8; 8.5]

[1.4; 5.8]

[1.7; 5.8]

[4.2; 8.7]

[0.1; 2.6]

[0; 8.2]

Mean hospitalization cost per patientd (€)

9 years meana

3,584

3,172

4,619

5,305

4,580

3,639

3,981

4,159

5,437

4,030

3,404

3,581

3 years meanb

4,709

3,252

4,234

4,752

4,231

3,714

3,898

4,162

4,856

3,973

3,901

3,556

[Min; Max]c

[2,160; 7,281]

[1,944; 3,896]

[3,045; 7,241]

[3,850; 6,695]

[3,558; 5,783]

[3,000; 4,152]

[3,148; 4,544]

[3,103; 5,295]

[3,285; 6,806]

[3,391; 4,514]

[2,178; 5,490]

[2,443; 4,632]

  1. LoS: length of stay
  2. a Includes 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; b Includes the most recent seasons, namely 2015/2016, 2016/2017, 2017/2018; c Minimum and maximum values observed throughout the analyzed seasons for each age group; d Includes > 1 influenza hospitalization/patient