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Table 1 The demographic characteristics of asthmatics and controls

From: CHI3L1polymorphisms associate with asthma in a Taiwanese population

  Asthma Na = 628 Control Na = 628 P valued
Age (years)b 51.44 ± 14.13 50.42 ± 11.84 0.522
Sex    
Male 289 (46.0%) 289 (46.0%) 1.000
Female 339 (54.0%) 339 (54.0%)  
Height (cm)b 162.15 ± 8.33 161.82 ± 8.28 0.481
Weight (kg)b 66.56 ± 12.47 63.04 ± 11.86 <0.001
BMI (kg/m2)ab 25.27 ± 4.07 23.95 ± 3.40 <0.001
WC (cm)ab 86.93 ± 11.18 78.58 ± 9.51 <0.001
Hips (cm)b 99.33 ± 8.88 95.74 ± 6.62 <0.001
WHRab 0.88 ± 0.08 0.82 ± 0.08 <0.001
IgE (IU/mL)b 262.04 ± 584.65 128.07 ± 291.48 <0.001c
YKL-40 (ng/mL)b 112.84 ± 111.56 95.65 ± 101.46 0.005c
Lung functionb    
FEV1%, pred 81.75 ± 21.53 92.17 ± 16.41 <0.001
FVC%, pred 85.75 ± 21.31 97.36 ± 17.05 <0.001
FEV1/FVC ratio 0.96 ± 0.15 0.95 ± 0.12 0.843
Smokers    
Current 69 (11.1%) 82 (13.1%) <0.001
Past 99 (15.9%) 44 (7.0%)  
Never 456 (73.1%) 502 (79.9%)  
Drinking habits    
Current 72 (11.5%) 60 (9.7%) 0.012
Past 38 (6.1%) 18 (2.9%)  
Never 515 (82.4%) 541 (87.4%)  
Indoor environmental factors    
Pets (dogs, cats, birds) 190 (30.4%) 103 (21.5%) 0.001
Appearance of cockroaches 491 (%) (%)  
Air cleaner 102 (16.3%) 66 (13.8%) 0.245
Dehumidifiers 140 (22.5%) 111(23.4%) 0.737
Carpet 26 (4.2%) 18 (3.8%) 0.752
Mold in walls 108(17.3%) 98(20.6%) 0.171
Indoor incense burning 402 (64.5%) 215 (45.2%) <0.001
Asthma history for father, yes 69 (11.2%) 23 (4.6%) <0.001
Asthma history for mother, yes 51 (8.2%) 17 (3.4%) <0.001
  1. a Abbreviations: BMI body mass index, WC waist circumference, WHR waist-to-hips ratio, N number of individuals.
  2. bValues are expressed as the means ± standard deviation (SD) unless otherwise stated.
  3. cThe P value of the IgE and YKL-40 serum levels was determined by t test after log-transformation.
  4. dThe P value was calculated for the continuous variables by the t test, and the χ2 test was used for the categorical variable.