In March, Loyola University Medical Center began opening earlier and keeping later hours at its outpatient clinics throughout the western and southwestern Chicago suburbs. Loyola doctors also opened offices on Saturdays at many of the more than two dozen clinics. In March, Loyola's clinic visits jumped 11% after more than 250 doctors added hours. By comparison, most months dating back to last fall had little or no growth, Loyola executives said. Since doctors began staying open later on March 17, clinic visits throughout the system are up on average about 1,100 a week based on past experience and projections through the end of June.