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Table 1 Descriptive characteristics of study participants with acute respiratory illness during four influenza seasons

From: A cross-sectional analysis of symptom severity in adults with influenza and other acute respiratory illness in the outpatient setting

Characteristic

N (%)

Mean ± SD symptom severity score

P-value1

Age (years)

   

  18-49

1299 (54.7)

12.7 ± 4.1

< 0.0001

  50-64

676 (28.5)

12.3 ± 4.0

 

  ≥ 65

399 (16.8)

10.8 ± 4.2

 

Gender (female)

1591 (67.0)

12.6 ± 4.1

< 0.0001

Health insurance

   

  Private only

1200 (50.6)

12.2 ± 3.8

0.56

  Public-assisted

1082 (45.6)

12.4 ± 4.4

 

vNone

92 (3.9)

12.2 ± 4.5

 

Study season

   

  2007-08

249 (10.5)

13.0 ± 4.1

0.006

  2008-09

672 (28.3)

12.4 ± 4.4

 

  2009-10

838 (35.3)

12.0 ± 4.0

 

  2010-11

615 (25.9)

12.2 ± 4.0

 

Days elapsed between symptom onset and date of enrollment

   

  0

67 (2.8)

10.0 ± 4.1

< 0.0001

  1-2

654 (27.6)

12.3 ± 4.0

 

  3-4

798 (33.6)

12.5 ± 4.1

 

  5-6

534 (22.5)

12.2 ± 4.1

 

  ≥ 7

321 (13.5)

12.1 ± 4.2

 

Number of ambulatory care visits within the past 5 years

   

  0-20

334 (17.4)

11.6 ± 4.0

0.009

  21-40

603 (31.4)

12.0 ± 4.0

 

  41-60

474 (24.7)

12.4 ± 4.1

 

  61-80

313 (16.3)

12.4 ± 4.3

 

  81-100

195 (10.2)

12.7 ± 4.1

 

  ≥ 101

   

Influenza infection

324 (13.7)

13.9 ± 3.9

< 0.0001

Presence of chronic disease

   

  Pulmonary disease

296 (12.5)

12.4 ± 4.2

0.43

  Diabetes

290 (12.2)

12.1 ± 4.2

0.43

  Cardiovascular disease

322 (13.6)

11.8 ± 4.4

0.05

Blood pressure (systolic/diastolic mmHg)

   

  < 120/80 (healthy)

724 (30.5)

12.3 ± 3.9

0.59

  120-139/80–89 (borderline)

1159 (48.8)

12.3 ± 4.2

 

  ≥ 140/90 (high)

491 (20.7)

12.1 ± 4.3

 

Total cholesterol (mg/dL)

   

  < 200 (healthy)

1644 (69.3)

12.1 ± 4.1

0.002

  200-239 (borderline)

566 (23.8)

12.7 ± 4.2

 

  ≥ 240 (high)

164 (6.9)

12.7 ± 4.1

 

Body mass index (kg/m2)

   

  < 25 (healthy)

465 (19.6)

12.3 ± 3.9

0.01

  25-29 (overweight)

648 (27.3)

12.3 ± 4.2

 

  ≥ 30 (obese)

1261 (53.1)

12.1 ± 4.3

 

Smoking status

   

  Never

1259 (53.0)

11.9 ± 3.9

< 0.0001

  Former

719 (30.3)

12.5 ± 4.3

 

  Current

396 (16.7)

12.9 ± 4.4

 
  1. 1P-value corresponds to t-test comparing symptom severity score between each characteristic category.
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BMC Infectious Diseases

ISSN: 1471-2334

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