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Table 1 Characteristics of the study population

From: Obesity and risk of respiratory tract infections: results of an infection-diary based cohort study

  All (N = 1455): Male (N = 524): Female (N = 931):  
Variable Category Absolute number Relative frequency (%) Absolute number Relative frequency (%) Absolute number Relative frequency (%) P-valued (gender)
BMI < 18.5 30 2.1 4 0.76 26 2.8 < 0.001
18.5–25 786 54.0 226 43.1 560 60.1  
25–30 452 31.1 219 41.8 233 25.0  
30–35 135 9.3 58 11.1 77 8.3  
35–40 34 2.3 9 1.7 25 2.7  
≥40 18 1.2 8 1.5 10 1.1  
missing 0   0   0   
Age (years) < 30 140 9.6 24 4.6 116 12.5 < 0.001
30–40 170 11.7 39 7.4 131 14.1  
40–50 367 25.2 110 21.0 257 27.6  
50–60 403 27.7 162 30.9 241 25.9  
≥60 375 25.8 189 36.1 186 20.0  
Educational level none 4 0.28 1 0.19 3 0.32 < 0.001
Hauptschulea 287 19.8 141 27.0 146 15.8  
Realschule/Mittlere Reifeb 470 32.4 122 23.3 348 37.5  
Abiturc 261 18.0 66 12.6 195 21.0  
university degree 428 29.5 193 36.9 235 25.4  
missing 5   1   4   
Smoking status never 789 54.3 248 47.4 541 58.1 < 0.001
former smoker 461 10.0 190 39.0 271 9.1  
current smoker 204 31.7 85 36.3 119 29.1  
missing 1   1   0   
Contact with children never 162 11.2 73 14.0 89 9.6 < 0.001
rarely 574 39.5 236 45.1 338 36.4  
weekly 292 20.1 90 17.2 202 21.7  
daily 424 29.2 124 23.7 300 32.3  
missing 3   1   2   
Co-morbidities:
 COPD/Lung emphysema yes 35 2.4 23 4.4 12 1.3 < 0.001
missing 10   3   7   
 Asthma yes 89 6.2 32 6.1 57 6.2 1.000
missing 14   3   11   
 Renal disease yes 16 1.1 9 1.7 7 0.76 0.116
missing 13   3   10   
 Blood disease yes 21 1.5 7 1.4 14 1.5 1.000
missing 13   6   7   
 Liver disease yes 55 3.8 27 5.2 28 3.0 0.046
missing 13   2   11   
 Rheumatoid disease yes 52 3.6 14 2.7 38 4.1 0.187
missing 14   6   8   
 Chronic intestinal disease yes 45 3.1 19 3.6 26 2.8 0.431
missing 11   3   8   
 Diabetes mellitus yes 46 3.2 23 4.4 23 2.5 0.060
missing 13   4   9   
  1. aSecondary general school, represents 9 years of school education; bIntermediate secondary school, represents 10 years of school education;cGeneral Higher Education Entrance Qualification, represents 12–13 years of school education; d the p-value for the gender difference is based on the Fisher’s exact test for comorbidities and on chi2 otherwise