Skip to main content

Table 1 Baseline characteristics of 203 patients with 2009 A/H1N1 influenza

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

 

All

Group 1

Group 2

Group 3

Group 4

P- values

(N = 203)

(N = 46)

(N = 64)

(N = 64)

(N = 29)

 

Age (years)

      

0–1

15 (7%)

5 (11%)

7 (11%)

2 (3%)

1 (3%)

0.198

1–5

56 (28%)

15 (33%)

20 (31%)

13 (20%)

8 (28%)

5–10

98 (48%)

15 (33%)

28 (44%)

39 (61%)

16 (55%)

>10

34 (17%)

11 (23%)

9 (14%)

10 (16%)

4 (14%)

Gender male

132(65%)

27 (59%)

44 (69%)

45 (70%)

16 (55%)

0.358

Underlying medical conditions

     

0.004

none

60 (30%)

13 (28%)

16 (25%)

24 (38%)

7 (24%)

asthma

57 (28%)

8 (17%)

20 (31%)

22 (34%)

7 (24%)

asthmatic diseases+

29 (14%)

2 (5%)

10 (16%)

9 (14%)

8 (28%)

other respiratory problems++

8 (4%)

3 (6%)

2 (3%)

2 (3%)

1 (4%)

immunocompromised *

4 (2%)

2 (5%)

0 (0%)

2 (3%)

0 (0%)

others**

45 (22%)

18 (39%)

16 (25%)

5 (8%)

6 (20%)

Heart Rate on admission

146

138

150

150

150

0.072

(bpm, median) IQR

133-160

100-175

128-172

121-179

128-172

Respiratory Rate on admission

37

24

40

38

40

< 0.001

(bpm, median) IQR

28-42

14-34

20-60

23-53

17-63

Body Temperature on admission

38.5

38.7

38.4

38.4

38.2

0.530

(°C, median) IQR

37.9-39.2

37.4-40.0

37.3-39.5

37.0-39.8

36.6-39.9

SpO2 on admission

94

98

96

93

94

< 0.001

(%, median) IQR

93-98

95-100

91-100

88-98

88-100

O2 demand on admission YES

39 (19%)

4 (9%)

9 (14%)

19 (30%)

7 (24%)

0.025

O2 demand during admission YES

129 (64%)

10 (22%)

41 (64%)

53 (83%)

25 (86%)

0.002

Time from the onset of illness (hr)

      

0–5

38 (19%)

11(23%)

14 (22%)

11 (17%)

2 (7%)

0.976

6–11

27 (13%)

1 (2%)

8 (12%)

13 (20%)

5 (17%)

12–23

61 (30%)

18 (41%)

14 (22%)

15 (23%)

14 (49%)

24–47

42 (21%)

11 (23%)

13 (20%)

11 (17%)

7 (24%)

48 -

20 (10%)

3 (7%)

8 (12%)

9 (14%)

0 (0%)

Unknown

15 (7%)

2 (4%)

7 (12%)

5 (9%)

1 (3%)

Systemic steroid use YES

84 (41%)

10 (22%)

24 (38%)

33 (52%)

17 (59%)

0.34

Antibiotics use YES

92 (45%)

5 (11%)

23 (36%)

51 (80%)

13 (45%)

0.10

Antiviral use YES

191 (94%)

42 (91%)

60 (94%)

62 (97%)

27 (93%)

0.994

  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.
  6. The definitions of group 1–4 were as follows:
  7. 1) Group 1. Normal finding.
  8. 2) Group 2. hilar and/or peribronchial markings alone.
  9. 3) Group 3. consolidation; patients with chest radiographs presenting with consolidation, and with or without other findings.
  10. 4) Group 4. other findings; patients whose chest radiographs included reticulonodularity or diffuse haziness of the lungs +/− hilar and/or peribronchial markings, hyperinflation, mediastinal emphysema, or subcutaneous emphysema.