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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.