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Table 1 Selected characteristics of cases and controls, Shanghai, China

From: Chronic typhoid infection and the risk of biliary tract cancer and stones in Shanghai, China

    Biliary Tract Cancer Biliary Stones
Characteristics Controls Gallbladder Extrahepatic Bile Duct Ampulla of Vater Gallbladder Stones Bile Duct Stones
  N % N % N % N % N % N %
Total 859 100.0 262 100.0 140 100.0 55 100.0 728 100.0 249 100.0
Age             
   <55 113 13.2 36 13.7 21 15.0 5 9.1 230 31.6* 56 22.5*
   55 - 64 247 28.8 64 24.4 37 26.4 13 23.6 207 28.4 75 30.1
   ≥65 499 58.1 162 61.8 82 58.6 37 67.3 291 40.0 118 47.4
Sex             
   Male 335 39.0 72 27.5* 84 60.0* 30 54.6* 250 34.3* 120 48.2
   Female 524 61.0 190 72.5 56 40.0 25 45.5 478 65.7 129 51.8
Education (% > Middle school) 293 34.1 57 21.8 45 32.4 16 29.1 313 43.0 94 37.8
Smoking (%)† 259 30.2 69 26.4 63 45.0* 25 45.5* 177 24.3* 92 37.0
Alcohol Use (%)‡ 177 20.6 42 16.0 45 32.1* 14 25.5 110 15.1* 48 19.4
Diabetes (%) 71 8.3 34 13.0* 12 8.6 3 5.5 78 10.7* 29 11.7*
Hypertension (%) 360 41.9 94 35.9 41 29.3* 14 25.5* 249 34.2 70 28.1*
Gallstones (%) 150 17.5 222 84.7* 93 66.4* 29 52.7* - - - -
Body Mass Index (% ≥25.0) 251 29.3 104 39.9 32 22.9 19 34.6 271 37.3 90 36.3
  1. * Chi-sq test comparing cases and controls, p < 0.05
  2. † Current smokers, defined as those who were smoking cigarettes regularly at the time of interview
  3. ‡ Current drinkers, defined as those drinking alcohol regularly at the time of interview