Operating income jumped by more than one-third last year at Mayo Clinic, as the Rochester-based hospital and clinic system posted its strongest performance in more than 25 years. The volume of patients seeking care from Mayo Clinic was strong, including sicker patients who stayed longer than anticipated, said Chief Financial Officer Kedrick Adkins Jr. At the same time, tight control on expenses meant that Mayo Clinic provided the care without a significant increase in labor costs, Adkins said. Expenses in 2014 were just 1.3 percent higher than during the previous year.
