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Table 4 Age-specific incidence of influenza-associated influenza-like illness (ILI) in the municipal district of Suzhou, Apr 2011-Mar 2014

From: Influenza-associated outpatient visits among children less than 5 years of age in eastern China, 2011–2014

Age group (month)

Resident population of children <5 years in the catchment area of SCH

Observed influenza positive cases at SCH

Estimated total no. of influenza -associated ILI at SCH (95 % CI)

Proportion of ILI who sought care at SCH (%)

influenza-associated ILI outpatient visits per 100 population (95 % CI)

Apr 2011-Mar 2012

     

 0- <6

11,057

19

420 (265–611)

66.7

5.7 (3.6–8.3)

 6- < 24

31,729

146

3,224 (2,036–4,686)

56.5

18.0 (11.4–26.1)

 24- < 60

56,836

241

5,319 (3,360–7,732)

47.4

19.7 (12.5–28.7)

 Total

99,622

406

8,956 (5,657–13,018)

51.6

17.4 (11.0–25.3)

Apr 2012-Mar 2013

     

 0- <6

12,393

10

487 (173–875)

50.0

7.9(2.8–14.1)

 6- < 24

35,564

72

3,514 (1,253–6,307)

43.2

22.9 (8.2–41.1)

 24- < 60

63,706

65

3,170 (1,130–5,689)

44.1

11.3 (4.0–20.2)

 Total

111,663

147

7,172 (2,557–12,872)

44.0

14.6 (5.2–26.2)

Apr 2013-Mar 2014

     

 0- <6

13,674

2

252 (128–394)

80.0

2.3 (1.2–3.6)

 6- < 24

39,241

37

4,660 (2,371–7,281)

52.6

22.6 (11.4–35.3)

 24- < 60

70,292

48

6,052 (3,079–9,457)

30.6

28.1 (14.3–44.0)

 Total

123,207

87

10,965 (5,579–17,132)

41.5

21.4 (10.9–33.5)

Apr 2011-Mar 2014

     

 0- <6

37,124

31

1,160 (568–1,881)

64.3

4.9 (2.4–7.9)

 6- < 24

106,533

255

11,398 (5,660–18,275)

50.8

21.1 (10.5–33.8)

 24- < 60

190,834

354

14,542 (7,570–22,879)

35.9

21.2 (11.0–33.4)

 Total

334,491

640

27,102 (13,799–43,035)

43.6

18.6 (9.5–29.5)