TABLE 3

Signs and Symptoms of Hospitalized Patients by Influenza Type

Sign or SymptomaInfluenza Typeb
Seasonal A (n = 2142)Influenza B (n = 1248)Unadjusted ORAdjusted ORc
Systemic
 Fever1990 (92.9)1167 (93.5)1.10 (0.83–1.46)
 Headache78 (3.6)123 (9.9)2.89 (2.16–3.88)1.85 (1.36–2.52)
 Lethargy741 (34.6)465 (37.3)1.12 (0.97–1.30)
Respiratory
 Coryza1277 (59.6)744 (59.6)1.00 (0.87–1.15)
 Cough1835 (85.7)1051 (84.2)0.89 (0.73–1.08)
 Wheezing476 (22.2)260 (20.8)0.92 (0.78–1.09)
 Respiratory distress904 (42.2)489 (39.2)0.88 (0.76–1.02)
 Apnea65 (3.0)37 (3.0)0.98 (0.65–1.47)
Extrarespiratory
 Abdominal pain119 (5.6)126 (10.1)1.91 (1.47–2.48)1.38 (1.05–1.81)
 Vomiting and/or diarrhea and/or dehydration1003 (46.8)569 (45.6)0.95 (0.83–1.10)
 Myalgia38 (1.8)102 (8.2)4.93 (3.37–7.20)3.19 (2.16–4.72)
 Arthralgia10 (0.5)15 (1.2)2.59 (1.16–5.79)1.95 (0.86–4.40)
 Seizure238 (11.1)116 (9.3)0.82 (0.65–1.04)
  • —, adjusted OR was not calculated.

  • a Individuals had >1 sign or symptom and percentages do not add up to 100%.

  • b Data are n (column %) unless otherwise indicated; data available only for 2006–2007 season onward.

  • c Adjusted for age group and health status.