By definition, the analysis focused on youth between the ages of six and twenty, inclusively. Programs which went beyond these boundaries were included if they met the methodology criteria; however, the examination of their results focused on those youth within the designated age range when the data were presented in a manner which permitted this type of analysis. The majority of participants in these evaluations were in grades four through nine, particularly during their initiation into the program.
The age profile of youth in the excluded programs was similar, although there was a noticeable trend for these programs to target slightly older children. The average range for this category of programs was fourth to 12th grade, with a few addressing children as young as first grade but the majority targeting sixth, seventh and eighth grade and beyond.