Fig. 2From: Allopurinol reduces the risk of myocardial infarction (MI) in the elderly: a study of Medicare claimsMultivariable-adjusted hazard ratios of MI by duration of allopurinol use by a age group, b gender and c race. For the multivariable-adjusted subgroup analyses by age, gender, and race, the main model was adjusted for all factors (age, gender, race, and Charlson-Romano comorbidity score) except the factor of interest, respectively, which was used to perform stratified analysis (age, gender, race)Back to article page