OR = Odds Ratio, CI = confidence Interval, (ref) = reference group, Ca = Cases, Co = controls. *Adjusted for age, gender, betel quid chewing, tobacco chewing, smoking and alcohol consumption.
Standardized incidence ratios (SIRs) and 95% confidence intervals (CIs) for gastrointestinal cancers in appendectomy patients, stratified by duration of follow-up.