Data were collected by use of mail-back school surveys, which were conducted during the 2006-2007, 2007-2008, and 2008-2009 school years. Data collection occurred primarily during the period from February through June of each school year. Our 2-part survey was mailed to the school principal with a request that the second section (from which these data were obtained) be completed by food service personnel; approximately half of the surveys were completed by food service personnel, with the rest completed by administrators, teachers, or other staff members. A $100 incentive was offered for completing and returning the survey. Surveys were processed and double-entered for quality assurance. Response rates were calculated by use of the American Association for Public Opinion Research method 2,25 which counts partial responses as complete. Response rates and number of responding cases were as follows across the 3 years, respectively. For public schools, the response rate and number of responding cases were as follows for the 2006-2007, 2007-2008, and 2008-2009 school years: 54.6% (578 schools), 70.6% (748 schools), and 61.8% (641 schools), respectively. For private schools, the response rate and number of responding cases were as follows for the 2006-2007, 2007-2008, and 2008-2009 school years: 66.2% (259 schools), 84.4% (336 schools), and 76.2% (297 schools), respectively. The survey protocol was approved by the University of Illinois at Chicago institutional review board.