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Table 1 Characteristics of the study participants

From: Discordance in Spirometric Interpretations Based on Korean and Non-Korean Reference Equations

  n (%) mean ± SD
Age (years)   44.5 ± 10.7
 20-39 299 (36.2)  
 40-49 232 (28.1)  
 ≥ 50 294 (35.6)  
Smoking History   
 Current smoker 513 (62.2) 15.8 ± 7.5*
 Non-current smoker 288 (34.9)  
Height (cm)   169.9 ± 5.7
Weight (kg)   68.3 ± 9.2
Chest X-ray   
 Normal 732 (88.7)  
 Abnormal 93 (11.3)  
FEV1 (ℓ)   3.6 ± 0.6
 Difference† (95% CI)   0.14 (0.05-0.23)
FVC (ℓ)   4.6 ± 0.7
 Difference† (95% CI)   0.16 (0.06-0.26)
FEV1/FVC (%)   
 ≥70 704 (85.3)  
 <70 121 (14.7)  
  1. * cigarettes per day.
  2. † difference between current smoker and non-current smoker.