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Table 2 Observed hospitalisations with primary diagnoses of influenza and ICD9 codes associated with influenza, by age groups. Seasons 2008/09 – 2018/19, Italy

From: Excess hospitalizations and in-hospital mortality associated with seasonal influenza in Italy: a 11-year retrospective study

Seasona

 

Influenza (ICD9 diagnosis 487)

All ICD9 codes associated with influenzab

0–4 years

5–14 years

15–64 years

 ≥ 65 years

Total

0–4 years

5–14 years

15–64 years

 ≥ 65 years

Total

2008/09

N

1,095

463

1,028

815

3,404

72,886

20,882

340,084

1,048,895

1,483,008

Ratec

39.0

8.4

2.6

6.8

5.7

2,595.9

377.5

874.0

8,769.0

2,504.6

2009/10

N

2,468

1,565

4,092

918

9,054

71,147

23,945

347,086

1,053,095

1,495,772

Rate

87.5

28.1

10.5

7.6

15.2

2,521.7

429.7

888.4

8,708.3

2,511.6

2010/11

N

1,163

577

1,523

759

4,022

67,592

22,396

335,004

1,026,908

1,451,913

Rate

41.3

10.3

3.9

6.2

6.7

2,398.2

399.3

854.9

8,414.4

2,427.2

2011/12

N

906

277

742

706

2,631

59,412

17,114

313,565

1,020,906

1,411,006

Rate

32.4

4.9

1.9

5.7

4.4

2,122.4

303.6

799.9

8,241.8

2,350.6

2012/13

N

1,189

442

1,058

760

3,449

57,617

17,577

307,113

992,889

1,375,196

Rate

42.9

7.8

2.7

6.0

5.7

2,078.0

310.4

784.9

7,861.1

2,284.7

2013/14

N

970

343

638

496

2,447

54,658

19,873

297,979

988,950

1,361,461

Rate

35.5

6.0

1.6

3.9

4.1

1,998.7

349.8

763.3

7,690.0

2,257.4

2014/15

N

1,171

408

1,162

1,066

3,807

55,362

18,429

298,718

1,004,708

1,377,221

Rate

43.8

7.2

3.0

8.1

6.3

2,070.6

324.1

768.3

7,681.0

2,283.2

2015/16

N

830

372

680

600

2,482

52,595

16,794

291,492

991,361

1,352,242

Rate

31.9

6.6

1.8

4.5

4.1

2,021.5

296.1

753.1

7,481.1

2,245.1

2016/17

N

756

290

768

1,314

3,128

52,248

15,683

283,149

986,112

1,337,192

Rate

29.9

5.1

2.0

9.8

5.2

2,067.2

278.0

734.4

7,363.7

2,224.4

2017/18

N

1,331

447

1,196

1,622

4,596

49,981

14,732

284,626

971,698

1,321,038

Rate

54.3

8.0

3.1

12.0

7.7

2,037.7

262.8

740.6

7,190.5

2,201.6

2018/19

N

1,115

355

1,331

1,841

4,642

50,224

17,164

284,540

968,675

1,320,630

Rate

46.9

6.4

3.5

13.5

7.8

2,113.3

308.7

742.7

7,107.4

2,205.6

Total

N

12,994

5,539

14,218

10,897

43,662

643,722

204,589

3,383,356

11,054,197

15,286,679

11-season mean

N

1,181.3

503.5

1,292.5

990.6

3,969.3

58,520.2

18,599.0

307,577.8

1,004,927.0

1,389,698.1

Rate

44.2

9.0

3.3

7.7

6.6

2,190.5

330.7

791.6

7,839.7

2,317.4

3-season meand

N

1,067.3

364.0

1,098.3

1,592.3

4,122.0

50,817.7

15,859.7

284,105.0

975,495.0

1,326,286.7

Rate

40.0

6.5

2.8

12.4

6.9

1,902.2

282.0

731.2

7,610.1

2,211.6

  1. aEach season extends from week 27 of one year to week 26 of the following year
  2. bSee list of ICD9 codes in Table A1 of the Additional file 1
  3. cEvery 100,000 inhabitants
  4. dIncludes the most recent seasons, namely 2016/17, 2017/18, and 2018/19
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BMC Infectious Diseases

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