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Table 2 The patient characteristics based on their clinical course

From: The value of radiographic findings for the progression of pandemic 2009 influenza A/H1N1 virus infection

  General ward PICU MV P- values
(N = 172) (N = 31) (N = 12)
Age (years)     
0–1 13 (7%) 2 (7%) 1 (8%) 0.10
1–2 8 (5%) 1 (3%) 0 (0%)
2–5 41 (24%) 6 (19%) 3 (25%)
5–10 79 (46%) 20 (64%) 8 (67%)
>10 31 (18%) 2 (7%) 0 (0%)
Gender male 111 (65%) 21 (68%) 8 (67%) 0.12
Underlying medical conditions     
None 48 (28%) 12 (39%) 3 (25%) 0.65
Asthma 51 (30%) 6 (19%) 5 (42%)
Asthmatic diseases+ 27 (16%) 2 (6%) 2 (17%)
Other respiratory problems++ 6 (3%) 1 (3%) 1 (8%)
Immunocompromised* 2 (1%) 2 (7%) 0 (0%)
Others** 38 (22%) 8 (26%) 1 (8%)
Heart Rate on admission (bpm, median) 146 147 152 0.71
IQR 136 - 158 126 - 152 132 - 180
Respiratory Rate on admission (bpm, median) 37 39 39 0.16
IQR 28 - 42 24 - 44 26 - 45
Body Temperature on admission (°C, median) 38.5 38.2 38.0 0.04
IQR 38.0 - 39.1 37.9 - 39.3 37.2 - 39.1
SpO2 on admission (%, median) 96 93 96 0.05
IQR 93 - 99 92 - 96 90 - 99
O2 demand on admission YES 16 (9%) 24 (77%) 11 (92%) < 0.001
O2 demand during admission YES 118 (69%) 26 (84%) 12 (100%) 0.13
Time from the onset of illness (hours)     
0–5 51 (30%) 4 (13%) 2 (17%) 0.99
6–11 40 (23%) 5 (16%) 3 (25%)
12–23 66 (37%) 6 (19%) 3 (25%)
24–47 10 (6%) 9 (29%) 1 (8%)
48 - 4 (3%) 5 (16%) 3 (25%)
Unknown 1 (1%) 2 (6%) 0 (0%)
Antibiotic use YES 72 (42%) 25 (81%) 12 (100%) < 0.001
Antiviral use YES 160 (93%) 31 (100%) 12 (100%) 0.77
  1. + Asthmatic diseases were defined as disorders including asthmatic bronchitis and cough variant asthma, but without a diagnosis of asthma.
  2. ++ “Other respiratory problems” included pulmonary hypoplasia, extralobar pulmonary sequestration, tracheal stenosis, and chronic lung disease.
  3. * “Immunocompromised” was used to indicate patients with nephrotic syndrome, and who were post-living donor liver transplantation for biliary atresia and propionic acidemia.
  4. ** Others included chromosomal abnormalities, renal diseases, and congenital heart diseases.
  5. IQR: interquartile range.