TABLE 2

Characteristics of Hospitalized Patients by Influenza Type

CharacteristicsInfluenza Typea
Influenza A (n = 2645)Influenza B (n = 1510)Unadjusted OR/P
Boys1554 (58.8)875 (57.9)0.97 (0.85–1.10)
Age, y
 Mean (SD)3.4 (3.9)5.0 (4.3)<.0001
 Median (IQR)2.0 (0.6–4.8)3.9 (1.4–7.2)<.0001
Age group<.0001
 0–5 mo586 (22.2)170 (11.3)
 6–23 mo749 (28.3)305 (20.2)
 24–59 mo681 (25.7)423 (28.0)
 5–9 y406 (15.3)401 (26.6)
 ≥10 y223 (8.4)211 (14.0)
Health status.0004
 No underlying condition1342 (50.7)684 (45.3)
 Vaccine-indicated condition976 (36.9)651 (43.1)
 Other underlying condition327 (12.4)175 (11.6)
Ethnic originb
 White532/845 (63.0)337/591 (57.0)
 Asian92/845 (10.9)60/591 (10.2)
 Middle Eastern51/845 (6.0)45/591 (7.6)
 Black49/845 (5.8)74/591 (12.5)
 Latin American17/845 (2.0)11/591 (1.9)
 Aboriginal81/845 (9.6)46/591 (7.8)
 Other/mixed23/845 (2.7)18/591 (3.0)
 Data not available675419
Influenza vaccination statusc
 Received influenza vaccine98/1504 (6.5)59/855 (6.9)
 Data not available555485
  • —, Inferential statistical analysis was not conducted.

  • a Data are n (column %) unless otherwise indicated; where fractions are shown, denominator is the number of cases with data available.

  • b Data available only for 2008–2009 season onward; n = 1520 (influenza A), n = 1010 (influenza B).

  • c Includes children ≥6 mo; n = 2059 (influenza A), n = 1340 (influenza B).