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Table 1 Basic characteristics of cases and controls in Taiyuan lung cancer study

From: TP53 genetic polymorphisms, interactions with lifestyle factors and lung cancer risk: a case control study in a Chinese population

Variable Cases Controls P value
  N (%) N (%)  
Age    
  ≤ 45 years 59 (14.8) 83 (17.8) 0.0725
  45 – 55 yrs 96 (24.1) 139 (29.8)
  55 – 65 yrs 111 (27.8) 116 (25.0)
  > 65 yrs 133 (33.3) 128 (27.4)
Gender    
  Male 202 (50.6) 234 (50.2) 0.9038
  Female 197 (49.4) 232 (49.8)
Education    
  Illiterate 43 (10.8) 23 (4.9) <.0001
  Primary school 106 (26.6) 81 (17.4)
  Junior middle school 124 (31.1) 175 (37.5)
  Senior middle school 68 (17.0) 120 (25.8)
  College or higher 58 (14.5) 67 (14.4)
Pack years of smoking    
  Non smokers 179 (44.9) 285 (61.2) <.0001
  < 20 pyrs 39 (9.8) 62 (13.3)
  20 – 40 pyrs 64 (16.0) 72 (15.5)
  ≥ 40 pyrs 117 (29.3) 47 (10.1)
Average income 10 years ago    
  < 1,000 yuan 104 (26.1) 106 (22.7) <.0001
  1,000 – 2,500 yuan 236 (59.1) 197 (42.3)
  ≥ 2,500 yuan 59 (14.8) 163 (35.0)
BMI (kg/m 2 )    
  < 18.5 22 (5.8) 9 (2.0) <.0001
  18.5 – 24.9 250 (66.3) 259 (56.3)
  25 – 29.9 90 (23.9) 162 (35.2)
  ≥ 30 15 (4.0) 30 (6.5)
Alcohol drinking    
  No 298 (74.7) 345 (74.0) 0.8267
  Yes 101 (25.3) 121 (26.0)
Tea drinking    
  No 242 (60.6) 263 (56.5) <.0001
  Previous drinkers 47 (11.8) 15 (3.2)
  Current drinkers 110 (27.6) 188 (40.3)
Total 399 466  
  1. Adjusted age, gender, education, pack years of smoking, alcohol drinking, tea drinking and average income 10 years ago.
  2. Significant differences were highlighted in bold.