Table 4.

Number of effect sizes showing effects (N=45).

				Total number of effect sizes reported		Human-supported interventions had significantly greater effects, n (%)		No significant differences between human-supported and unsupported interventions, n (%)		Unsupported interventions had significantly greater effects, n (%)
Outcome domains
	Anxiety		12		4 (33)		7 (58)		1 (8)
	Depression		19		9 (47)		8 (42)		2 (10)
	PTSDa		2		1 (50)		1 (50)		0 (0)
	Stress		3		2 (66)		0 (0)		1 (33)
	Multiple		9		6 (66)		3 (33)		0 (0)
Sample characteristics
	Clinical or subclinical		21		12 (57)		9 (42)		0 (0)
		Anxiety disorders	1		1 (100)		0 (0)		0 (0)
		Social anxiety	2		0 (0)		2 (100)		0 (0)
		Depression	6		3 (50)		3 (50)		0 (0)
		Anxiety disorders or depression	4		3 (75)		1 (25)		0 (0)
		PTSD	3		1 (33)		2 (66)		0 (0)
		Unrestricted mental health conditions	5		4 (80)		1 (20)		0 (0)
	Unrestricted samples		24		10 (41)		10 (41)		4 (16)
Quality of RCTb
	High		2		1 (50)		1 (50)		0 (0)
	Medium		19		9 (47)		8 (42)		2 (10)
	Low		24		12 (50)		10 (41)		2 (8)
Type of human support
	Clinically trainedc		17		8 (47)		8 (47)		1 (5)
	Mixedd		9		7 (77)		2 (22)		0 (0)
	Uncleare		19		7 (36)		9 (47)		3 (15)

^aPTSD: posttraumatic stress disorder.

^bRCT: randomized controlled trial.

^cClinically trained is defined as a therapist, clinical psychologist, or clinical psychology trainee.

^dMixed support providers included both clinically trained individuals and individuals who did not have clinical training providing support for DMHIs.

^eUnclear means that the authors did not provide information about the type of support provider in the meta-analysis.