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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)