Table 1.

Prevalence of gallstones among gallbladder cancer case–control study participants.

Presence of gallstone
GBC (n = 1,170)Controls (n = 2,525)
VariableN (%)N (%)
Self-reported gallstone using stringent definitiona145 (12.4)54 (2.1)
Self-reported gallstone historyb468 (40.0)60 (2.4)
GenderMale120 (25.6)13 (21.7)
Female348 (74.4)47 (78.3)
Geographical regionsNorth207 (44.2)16 (26.7)
Northeast181 (38.7)28 (46.7)
South1 (0.2)1 (1.6)
West47 (10.0)12 (20.0)
Central32 (6.8)3 (5.0)
  • Abbreviation: GBC, gallbladder cancer.

  • aSelf-reported gallstone using stringent definition. Gallstone history was ascertained using definition of self-reported gallstone; however, those gallstones diagnosed within a year prior to the date of diagnosis of gallbladder cancer for cases or within a year prior to the date of interview for controls were excluded from the analysis.

  • bSelf-reported gallstone; reported by study participant as either present/not present.