Trend of numbers of robotic delivery trips per day at the three pharmacies over the study period. The Harry and Jeanette Weinberg Building pharmacy (panel C) installed robots in September 2006 and had statistically significant increases in the number of trips made each day (regression line, p < 0.001). Panels A and B show the number of trips per day at the Shock/Trauma Center pharmacy and the Gudelsky Build- ing pharmacy, respectively.