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Table 1 General characteristics of the study group

From: Association of CYP1A1, GSTM1 and GSTT1 gene polymorphisms with risk of non-small cell lung cancer in Andhra Pradesh region of South India

Variables Patients n = 246 (%) Controls n = 250 (%) p value
Gender
 Male 177 (71.95) 180 (73.91) 0.99
 Female 69 (28.05) 70 (26.09) 0.99
Age
 Mean ± (SD) 57.57 ± 10.19 58.06 ± 9.56  
Stages of NSCLC
 II 28 (7.66)   
 III 82 (34.23)   
 IV 136 (58.11)   
Histology
 Squamous-cell carcinoma 97 (43.24)   
 Adenocarcinoma 109 (48.65)   
 Large cell and others 40 (8.11)   
Alcoholism
 Consumers 95 (38.62)* 26 (10.4) 0.01
 Non-consumers 151 (61.38)* 224 (89.6) 0.01
Smoking status
 Never-smokers 98 (39.84)* 175 (69.08) <0.001
 Ex-smokers 42 (17.07)* 12 (4.35) <0.001
 Current smokers 106 (43.08) * 63 (26.57) <0.001
 ≤20 pack years 38 (15.45) 28 (11.2) 0.16
 21–40 pack years 34 (13.82)* 18 (7.2) 0.01
 41–60 pack years 8 (3.25) 5 (18.85) 0.38
 >60 pack years 26 (10.57)* 12 (7.72) 0.01
 Passive smokers 38 (15.45)* 5 (2) <0.001
  1. * p < 0.05