Table 1

mEH genotype frequencies of cases and controls stratified by age, gender, pack-years, smoking status, and histological subtypes

Case (%)Control (%)
nVery lowLowIntermediateHighnVery lowLowIntermediateHigh
Total97414.427.138.020.5114213.825.741.219.4
Age
 <5517716.420.940.722.042513.725.240.920.2
 55–6426014.628.136.520.829912.423.842.821.1
 ≥6553713.628.737.819.941814.827.540.217.5
Gender
 Female44314.226.037.022.861714.425.939.919.8
 Male53114.528.138.818.652513.025.342.719.1
Pack-yr
 05819.022.443.115.540212.427.639.320.7
 1–199619.815.638.526.029911.423.842.522.4
 20–3919914.629.738.717.121817.924.844.013.3
 40–5924312.825.538.323.512111.628.141.319.0
 60–7915012.728.036.722.74818.818.845.816.7
 ≥8022813.632.036.418.05420.425.931.522.2
Smoking Statusa
 Ex-smokers51915.028.734.521.852913.824.642.019.7
 Current-smokers39712.925.741.819.721116.124.642.716.6
Histologyb
 AC43215.326.437.021.3
 SCC22211.326.141.021.6
 Others17414.928.235.121.8
  • a Nonsmokers were individuals with pack-years = 0.

  • b Histological data were available for 828 cases.