Table 4. Participant-related characteristics of the studies.

Category			N	%
Grade level
	Elementary school	Low (1–3)	19	59.4	87.6
		High (4–6)	7	21.9
		Low + High	2	6.3
	Middle school		3	9.4
	High school		1	3.1
Exceptionality type
	With or at risk of learning disability		9	28.1
	Low achievement		2	6.3
	Under achievement		14	43.8
	Intellectual disability		5	15.6
	Other		2	6.3
School type
	General classroom		20	62.5
	Special education classroom		6	18.8
	Special school		1	3.1
	Mixed		3	9.4
	Other		2	6.3
Total			32	100