Using logistic regression with forward selection, we found in the resident physician cohort those with advanced years in training or history of an A/I rotation were more likely to have increased past history of referral to an allergist (OR = 4.09, OR = 3.81), increased referral intention for chronic sinusitis to an allergist (OR = 3.51, OR = 5.18), and increased perceived A/I knowledge (OR = 2. .