Demographic features of cases and controls
| Characteristics | No. of cases (%) | No. of controls (%) |
|---|---|---|
| Subjects included in the study | 72 | 324 |
| Subjects used for matched analysisa | 49/72 (68) | 211/324 (65) |
| H. pylori positive by four methods combinedb | 57/72 (79) | 213/324 (66) |
| H. pylori positive by culture | 29/72 (40) | 126/324 (39) |
| H. pylori positive by immunohistochemistry | 30/72 (42) | 126/323 (39) |
| H. pylori positive by ELISA | 43/65 (66) | 136/310 (44) |
| H. pylori positive by immunoblotting | 51/66 (77) | 203/308 (66) |
| Female | 20/72 (28) | 114/324 (35) |
| Mean (SE) age (yrs) | 72.7 (12) | 70.9 (12) |
| Subjects included from Kalmar Hospitalc | 29/72 (40) | 222/324 (68) |
| Questionnaire response rate | 40/72 (56) | 213/324 (66) |
a Cases matched by at least one control.
b Culture, immunohistochemistry, ELISA, and immunoblotting.
c The highest number of subjects included were from this hospital.