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Table 1 The demographic character of study subjects

From: Absence of association between SERPINE2genetic polymorphisms and chronic obstructive pulmonary disease in Han Chinese: a case-control cohort study

  Cases Controls
Subjects (n) 327 349
Male (%) 80.1 71.9
Age 71.4 ± 9.1 * 67.0 ± 9.8 #
Smoking (pack-yrs) 30.2 ± 6.7 29.2 ± 6.9
FEV1/FVC 45.3 ± 15.6 86.4 ± 5.8
FEV1 % pred 54.9 ± 18.9 94.9 ± 8.7
FEV1 > 50% pred 170 0
FEV1 ≤ 50% pred 157 0
  1. * data available for 210 patients, # data available for 208 subjects.
  2. Data are presented as mean ± SD.