TABLE 2

Health Status and Complications Among Children With Asthma Hospitalized With Laboratory-Confirmed Influenza, EIP Surveillance for Influenza-Associated Hospitalizations, 2003–2009 (N = 1343)

B, Reference, n (%)Seasonal A, n (%)Odds Ratio (95% Confidence Interval)2009 H1N1, n (%)Odds Ratio (95% Confidence Interval)
Total116494733
No additional underlying medical conditionsa67 (58)365 (74)2.1 (1.4–3.1)540 (74)2.0 (1.4–3.1)
ICD-9 diagnosis of pneumoniab,c37/92 (40)157/404 (39)0.9 (0.6–1.5)276/603 (46)1.3 (0.8–2.0)
ICD-9 diagnosis of asthma exacerbationb33/112 (29)233/469 (50)2.4 (1.5–3.7)359/700 (51)2.5 (1.6–3.9)
ICU admission17 (15)85 (17)1.2 (0.7–2.1)158 (22)1.6 (0.9–2.8)
Respiratory failured7 (6)24 (5)0.8 (0.3–1.9)35 (5)0.8 (0.3–1.8)
  • a Of the following underlying conditions: cardiovascular disease; chronic lung disease; chronic metabolic disease; febrile seizures; hemoglobinopathies; immunosuppression; neurologic disorders, including cerebral palsy and seizure disorders; and pregnancy.

  • b Excluding cases with missing ICD-9 code data.

  • c Of children who had chest radiographs during their hospitalizations.

  • d Defined as requiring mechanical ventilation.