Table 4.

Study classifications, sub-classifications, and their representative number of studies and underpinning theory.

Main classification	Sub-classification	Number of studies	Underpinning theory (mechanisms)
Pharmacological	Stimulants	48	Chemical imbalance in neural networks
	Non-stimulants	27
	Anti-depressants	8
	Mixture	4
Psychosocial	Cognitive behavioral therapy	14	Impact of thought on behavior and emotions
	Skills training/Coaching	11	Psychoeducation
	Attention/cognitive training	8	Regulating attention and improving cognition
	Mindfulness	6	Regulating attention
	Alternate therapies	2
Combination	Stimulant and psychosocial	15	Holistic approach