Table 2

Conditional logistic regression-derived crude and adjusted ORs and 95% CIs for the association between the studied variables and gastric cancer

VariablesNumberCrudeAdjusted
Cases (n = 174)Controls (n = 462)OR95% CIORa95% CI
Long-term antibiotic treatment before surgery
No167414Ref.cRef.
Yes7480.30.2–0.80.30.1–0.7
Prophylactic antibiotic treatmentb
No4490Ref.Ref.
Yes1293670.70.4–1.10.70.5–1.1
Maximum prophylactic antibiotic dose per dayb
None4490Ref.Ref.
Below median (3 DDD)661780.70.5–1.20.70.4–1.2
Above median621830.70.4–1.10.70.4–1.2
Weight-adjusted maximum prophylactic antibiotic doseb
None2448Ref.Ref.
Below median (0.04 DDD/kg)521250.70.4–1.40.70.3–1.4
Above median431330.50.2–1.00.50.2–1.1
P for trend = 0.13
Cumulative prophylactic antibiotic doseb
None4490Ref.Ref.
Below median (15.5 DDD)591820.70.4–1.10.70.4–1.1
Above median631770.70.4–1.10.70.4–1.2
Weight-adjusted cumulative prophylactic antibiotic doseb
None2448Ref.Ref.
Below median (0.21 DDD/kg)451280.70.3–1.40.70.3–1.4
Above median451300.50.3–1.10.60.3–1.2
P for trend = 0.29
Regular use of aspirin before surgery
No133334Ref.Ref.
Yes411280.80.5–1.20.80.5–1.2
  • a Adjusted for gender, age, history of gastric resection, and regular use of aspirin.

  • b Frequencies do not sum to total because of missing data.

  • c Ref., referent group.