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Table 1 Characteristics of patients admitted to ICUsa

From: When should a diagnosis of influenza be considered in adults requiring intensive care unit admission? Results of population-based active surveillance in Toronto

Characteristics

Influenza-positive/total, n(%)

 

2007/2008 and 2008/2009 influenza seasons

2009 H1N1 pandemic, second wave

Total number of patients

97/2,171 (4.5)

29/245 (11.8)

Gender

  

   Males

50/1,197 (4.2)

19/127 (15.0)

   Females

46/972 (4.7)

10/118 (8.5)

Age, years

  

   All patients, median (IQR)

72.0 (59.4 to 80.5)

67.5 (52.8 to 79.7)

   18 to 44

6/168 (3.6)

9/35 (25.7)

   45 to 64

24/596 (4.0)

14/78 (18.0)

   65 to 84

54/1,147 (4.7)

6/107 (5.6)

   ≥85

13/260 (5.0)

0/25 (0.0)

Admitted from long-term care facility

7/95 (7.4)

4/13 (30.8)

Temperature on admission, °C

  

   All patients, years, median (IQR)

36.6 (36.0 to 37.2)

36.7 (36.2 to 37.5)

   <38.0°C

74/1,964 (3.8)

18/217 (8.3)

   ≥38.0°C

23/207 (11.1)

11/28 (39.3)

Respiratory symptoms upon hospital admission

  

   Absent

9/628 (1.4)

1/55 (1.8)

   Present

87/1,449 (6.0)

27/184 (14.7)

Admission diagnosis

  

   Respiratory infectionb

34/298 (11.4)

17/49 (34.7)

   Respiratory failurec

22/212 (10.4)

3/25 (12.0)

   Sepsis/fever

4/101 (4.0)

2/15 (13.3)

   Any cardiac diagnosis

26/939 (2.8)

3/52 (5.8)

  1. aIQR: interquartile range; b'pneumonia' and 'other respiratory infection'; c'chronic obstructive pulmonary disease exacerbation', 'asthma exacerbation' and 'respiratory failure'.
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