Table 10. Coding system for the Level-2 predictors.

Predictors		Coding
		0	1
Participant-related variables
	Grade level	Elementary school	Middle or high school
	Exceptionality type	with or at risk of learning disability	Without or not at risk of learning disability
		With low or under-achievement	Without low or under-achievement
		With intellectual disability	Without intellectual disability
	Gender	Male	Female
	School type	General classroom	Other than general classroom
Intervention-related variables
	Number of sessions	19 sessions or less	More than 19 sessions
	Number of sessions per week	1	2–3
	Length of each session	45 minutes or less	More than 45 minutes
	Duration	9 weeks or less	More than 9 weeks
	Group size	One-on-one	Group
DBI-related variables
	Measurement frequency for monitoring	Every session	Every 2 or more sessions
	Data-based decision rule	Including slope-based rule	Without including slope-based rule
	Instructional adaptation	Specified	Not specified