TABLE 5

Factors Associated With Radiologically Confirmed Pneumonia in Patients Hospitalized With Influenza B

Radiologically Confirmed Pneumonia
Univariate Analysis (n = 1510)Multivariable Analysisa (n = 1510)
OR (95% CI)POR (95% CI)P
Boys0.94 (0.74–1.20).63
Age, y0.98 (0.95–1.01).13
Age group<.0001<.0001
 0–5 moReferenceReference
 6–23 mo3.29 (1.94–5.57)<.00012.88 (1.69–4.91)<.0001
 24–59 mo3.33 (2.00–5.54)<.00012.66 (1.58–4.47).0002
 5–9 y1.75 (1.03–2.98).041.40 (0.82–2.40).22
 ≥10 y2.03 (1.15–3.60).011.48 (0.82–2.66).19
Health status<.0001<.0001
 No underlying conditionReferenceReference
 Vaccine-indicated condition1.95 (1.51–2.52)<.00011.93 (1.47–2.51)<.0001
 Other underlying condition1.27 (0.85–1.90).251.25 (0.83–1.89).28
  • —, sex and age (in years) were not included in the multivariable model.

  • a Multivariable model included age group and health status as independent variables.