Table 2.
Characteristics of influenza-positive patients admitted to ICUsa
| Characteristics | Influenza A (seasonal) (n = 55) | Influenza B (n = 42) | Pandemic H1N1 (n = 29) | P value |
|---|---|---|---|---|
| Male gender, n (%) | 26 (47.3) | 24 (58.5) | 19 (65.5) | 0.24 |
| Median age, years (IQR) | 77.6 (63.7 to 83.6) | 73.3 (57.2 to 80.8) | 50.1 (43.6 to 61.9) | <0.001 |
| 18 to 44, n (%) | 4 (7.3) | 2 (4.8) | 9 (31.0) | 0.001 |
| 45 to 64, n (%) | 10 (18.2) | 14 (33.3) | 14 (48.3) | 0.015 |
| 65 to 84, n (%) | 34 (61.8) | 20 (47.6) | 6 (20.7) | 0.002 |
| ≥85, n (%) | 7 (12.7) | 6 (14.3) | 0 (0.0) | 0.09 |
| Median admission temperature, °C (IQR) | 37.1 (36.4 to 37.7) | 36.7 (36.1 to 37.8) | 37.7 (37.3 to 38.2) | 0.004 |
| >38.0°C, n (%) | 13 (23.6) | 10 (23.8) | 11 (37.9) | 0.32 |
| Respiratory symptoms, n (%) | 51 (92.7) | 36 (87.8) | 27 (96.4) | 0.44 |
| Admission diagnosis | ||||
| Respiratory infectionb | 18 (32.7) | 16 (38.0) | 17 (58.6) | 0.06 |
| Respiratory failurec | 11 (20.0) | 11 (26.2) | 3 (10.3) | 0.26 |
| Sepsis | 3 (5.5) | 1 (2.4) | 2 (6.9) | 0.65 |
| Cardiac | 16 (29.1) | 10 (23.8) | 3 (10.3) | 0.15 |
aIQR: interquartile range; b'pneumonia' and 'other respiratory infection'; c'chronic obstructive pulmonary disease exacerbation', 'asthma exacerbation' and 'respiratory failure'.