From: Chronic typhoid infection and the risk of biliary tract cancer and stones in Shanghai, China
 | Biliary Tract Cancer | Biliary Stones | |||||||
---|---|---|---|---|---|---|---|---|---|
 | Controlsa | Total | Gallbladder | Extrahepatic Bile Duct | Ampulla of Vater | Controlsb | Biliary Stones | Gallbladder Stones | Bile Duct Stones |
Typhoid | N | N OR (95%CI) | N OR (95%CI) | N OR (95%CI) | N OR (95%CI) | N | N OR (95%CI) | N OR (95%CI) | N OR (95%CI) |
Total | 859 | 457 | 262 | 140 | 55 | 654 | 977 | 728 | 249 |
Negativec | 858 | 456 | 262 | 139 | 55 | 654 | 973 | 726 | 247 |
Positive | Â | Â | Â | Â | Â | Â | Â | Â | Â |
   ≥1:160d | 1 | 1 1.9 (0.1-31.1) | 0 | 1 5.9 (0.4-95.2) | 0 | 0 | 4 | 2 | 2 |