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Table 1 Study subject characteristics and baseline spirometry data*

From: The association of Toll-like receptor 4 gene polymorphisms with the development of emphysema in Japanese subjects: a case control study

  Emphysema Controls
Number of subjects 106 137
Male/Female 102/4 133/4
Age (years) 71.3 ± 6.8† 63.2 ± 10.0
Smoking history (pack-years) 63.3 ± 28.1† 39.6 ± 18.7
FEV1 (liter) 1.47 ± 0.66† 2.64 ± 0.51
FEV1 (% pred) 54.7 ± 22.8† 88.8 ± 13.1
FEV1/FVC (%) 48.4 ± 11.2† 80.3 ± 5.7
  1. *Data are expressed as mean ± SD
  2. Abbreviations: FEV1 forced expiratory volume in 1 second; % pred percent of the predicted value; FVC forced vital capacity
  3. p < 0.001 versus controls by the Mann-Whitney U test