Table 3.

Confounding Variables for Non-Randomized Studies.

Teacher outcome measures	Pupil outcome measures
Characteristics of teachers	Characteristics of pupils
Previous knowledge of ADHD	Age of child
Years of teaching	Gender of child
ADHD medication for children	Severity of ADHD
Contamination if teachers from the same school are in both the intervention and control groups	Comorbidities
Experience of management of student with ADHD	ADHD medication for children
Characteristics of delivery	Characteristics of delivery
Duration and mode of delivery within study	Duration and mode of delivery within study
Characteristics of the school/ setting	Characteristics of the school/ setting
Differences between schools	Differences between schools