TABLE 2.
Presenting Symptoms, Vital Signs, and Evaluation of Patients with Pandemic (H1N1) 2009 Influenza or Seasonal Influenza
| Variable | No. (%) of patients
|
OR (95% CI) | P | |
|---|---|---|---|---|
| Pandemic (H1N1) 2009 influenza (n = 49) | Seasonal influenza (n = 503) | |||
| Sign or symptom | ||||
| Cough | 48 (98) | 419 (83) | 9.62 (1.59–392.38) | .01 |
| Dyspnea | 21 (43) | 268 (53) | 0.66 (0.35–1.24) | .18 |
| Sputum production | 24 (49) | 200 (40) | 1.45 (0.77–2.73) | .21 |
| Myalgia | 35 (71) | 233 (46) | 2.90 (1.47–5.97) | .001 |
| Pleuritic pain | 22 (45) | 75 (15) | 2.67 (1.44–4.82) | <.001 |
| Nasal congestion or coryza | 18 (37) | 150 (30) | 1.37 (0.70–2.61) | .32 |
| Pharyngitis | 12 (24) | 61 (12) | 2.35 (1.05–4.91) | .02 |
| Headache | 13 (27) | 109 (22) | 1.31 (0.61–2.63) | .43 |
| Delirium | 4 (8) | 73 (15) | 0.52 (0.13–1.50) | .22 |
| Wheezing | 8 (16) | 96 (19) | 0.83 (0.32–1.86) | .64 |
| Sick contacts | 14 (29) | 63 (13) | 2.79 (1.31–5.67) | .002 |
| Vital signs | ||||
| Maximum temperature, °C, median (95% CI) | 38.6 (38.2–38.8) | 38.3 (38.2–38.6) | … | .40 |
| Tachycardiaa | 7 (14) | 63 (13) | 1.16 (0.42–2.77) | .72 |
| Hypotensionb | 1 (2) | 26 (5) | 0.38 (0.01–2.44) | .33 |
| Tachypneac | 3 (6) | 36 (7) | 0.85 (0.16–2.85) | .79 |
| Requirement of oxygen treatment | 7 (14) | 82 (16) | 0.86 (0.37–1.97) | .71 |
| Evaluation | ||||
| Serum creatinine level, mg/dL, median (95% CI) | 0.9 (0.78–1.29) | 1.1 (1.0–1.2) | … | .12 |
| White blood cell count, thousands/μL, median (95% CI) | 6.7 (6.1–8.2) | 7.1 (6.6–7.7) | … | .80 |
| Infiltrate on chest radiograph | 8 (16) | 87 (17) | 0.93 (0.36–2.11) | .86 |
NOTE. CI, confidence interval; OR, odds ratio.
a
Defined as a pulse rate of more than 125 beats per minute.
b
Defined as systolic blood pressure of less than 90 mm Hg.
c
Defined as a respiration rate of more than 30 breaths per minute.