Table 2.

Classification of individuals based on entrances and exits for the first and third Baltimore Prevention Program trials

	Type	1st Generation BPP Trial (intervention through 1st and 2nd Grades)	3rd Generation BPP Whole Day (WD) Trial (intervention through 1st Grade)
1	Completer	Any child who began attending first grade in one intervention condition and remained in one of the study classrooms to the end of second grade.	Same definition through 1st Grade.
2	Program dropout	Any child who began first grade in one intervention condition, was exposed to a portion of the intervention and moved outside the study’s classrooms prior to the end of the second year.	Same definition through 1st Grade.
3	Late entrant	Any child who transferred into one of the study’s first grade classrooms after intervention began and remained in one of the study classrooms through the end of the second year.	Same definition through 1st Grade.
4	Late entrant/program dropout	A child who entered one of the study classrooms after the intervention began and moved outside the study’s classrooms prior to the end of the second year.	Same definition through 1st Grade.
5	No show	No data available.	Any child who was registered to attend a study school during the summer before first grade, was assigned to a first-grade classroom but never attended the school.