Table 1.
Distributions of selected variables by case–control status.
| Selected characteristics | Controls, n (%) | Biliary stonesa, n (%) | Biliary tract cancers |
||
|---|---|---|---|---|---|
| Gallbladderb, n (%) | Bile ductc, n (%) | Ampulla of Vaterc, n (%) | |||
| All subjects | 447 (100) | 429 (100) | 253 (100) | 133 (100) | 53 (100) |
| Age at interview | |||||
| Age at interview | |||||
| 34–54 | 58 (13.0) | 124 (28.9) | 39 (15.4) | 21 (15.8) | 5 (9.4) |
| 55–64 | 123 (27.5) | 118 (27.5) | 61 (24.1) | 36 (27.1) | 12 (22.7) |
| 65–75 | 266 (59.5) | 187 (43.6)⁎ | 153 (60.5) | 76 (57.1) | 36 (67.9) |
| Gender | |||||
| Male | 178 (39.8) | 159 (37.1) | 68 (26.9) | 79 (59.4) | 29 (54.7) |
| Female | 269 (60.2) | 270 (62.9) | 185 (73.1)⁎ | 54 (40.6)⁎ | 24 (45.3)⁎ |
| Ever smoke | |||||
| Yes | 145 (32.4) | 121 (28.2) | 66 (26.2) | 60 (45.1) | 25 (47.2) |
| No | 302 (67.6) | 308 (71.8) | 186 (73.8) | 73 (54.9)⁎ | 28 (52.8)⁎ |
| Gallstones | |||||
| Yes | 106 (23.7) | 429 (100.0) | 214 (84.6) | 89 (66.9) | 29 (54.7) |
| No | 341 (76.3) | – | 39 (15.4)⁎ | 44 (33.1)⁎ | 24 (45.3)⁎ |
| Ever drink alcohol | |||||
| Yes | 91 (20.4) | 70 (16.3) | 40 (15.8) | 40 (30.1) | 14 (26.4) |
| No | 356 (79.6) | 359 (83.7)⁎ | 213 (84.2) | 93 (69.9)⁎ | 39 (73.6) |
| Diabetes | |||||
| Yes | 65 (14.6) | 69 (16.2) | 26 (10.3) | 25 (18.9) | 7 (13.2) |
| No | 381 (85.4) | 356 (83.8) | 227 (89.7) | 107 (81.1) | 46 (86.8) |
Note. Total number of subjects may vary due to missing values.
a
Biliary stone (gallstone and bile duct stone) cases compared with controls without biliary stones (n = 341).
b
Gallbladder cancer cases compared with population controls who had a gallbladder (n = 422).
c
Bile duct and A.V. cancer cases compared with all population controls (n = 447).
⁎
P < 0.05.