Before revision:  Furthermore, DDI risk increases dramatically with age, with patients age 70-79 having a 50-fold risk increase in comparison to patients aged 0-19 . Interestingly, several null models demonstrate that this risk increase is not due to increased polypharmacy with age.
After revision:  Furthermore, DDI risk increases dramatically with age, with patients age 70-79 years have a 34\% risk of DDI when they are prescribed two or more drugs concomitantly . Interestingly, several null models demonstrate that this risk increase is not due to increased polypharmacy with age.