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Table 1 Characteristics of the study population

From: Relationship between cyclooxygenase 8473T>Cpolymorphism and the risk of lung cancer: a case-control study

Variable Cases (n = 582) Controls (n = 582)
Age (years) 61.3 ± 9.4 60.2 ± 9.6
Sex
   Male 467 (80.2)a 467 (80.2)
   Female 115 (19.8) 115 (19.8)
Smoking statusb
   Current 387 (66.5) 297 (51.0)
   Former 85 (14.6) 147 (25.3)
   Never 110 (18.9) 138 (23.7)
Pack-yearsc 40.0 ± 17.7 34.1 ± 17.8
  1. aNumbers in parenthesis, percentage.
  2. b P < 0.001.
  3. cIn current and former smokers, P < 0.001.