TABLE 1.

Characteristics of Hospitalized and Nonhospitalized Patients

CharacteristicsHospitalized (n = 182) Number (%)Nonhospitalized (n = 114) Number (%)OR (95% CI)P
Decreased oxygen saturation52 (29%)2 (2%)22.6 (5.4–94.8)
Seizures23 (13%)4 (4%)4.0 (1.3–11.9)
Dehydration25 (14%)5 (4%)3.5 (1.3–9.4)
Pneumonia18 (10%)4 (4%)3.0 (1.0–9.2)
Sex (male)107 (59%)54 (47%)1.6 (1.0–2.6)
Absolute neutrophil count (× 109) mean ± SD5.0 ± 3.93.8 ± 2.5.01
Nasal congestion131 (72%)96 (84%)0.5 (0.3–0.9)
Age (<12 mo)92 (50%)56 (49%)1.0 (0.6–1.6)
Age in months (mean ± SD)26.1 ± 40.331.4 ± 48.8.25
Underlying medical condition54 (30%)30 (26%)1.2 (0.7–2.0)
Vaccine candidate33 (18%)24 (21%)0.8 (0.5–1.5)
Infected with influenza A143 (79%)84 (74%)1.3 (0.7–2.3)