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Table 2 Characteristics of the study population

From: Polymorphisms in the epidermal growth factor receptor gene and the risk of primary 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. a Numbers in parenthesis, percentage.
  2. b P < 0.001.
  3. c In current and former smokers, P < 0.001
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BMC Cancer

ISSN: 1471-2407

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