Table 2.

Quality assessment of included quantitative studies.

Authors (Year)		Criteria														Quality Rating
		1	2	3	4	5	6	7	8	9	10	11	12	13	14
Gondolf (2004) [14]	Assessed with Quality Assessment Tool for Controlled Intervention Studies (Criteria B)	+	+	−	?	?	+	+	−	+	+	+	+	+	+	Fair
Zellerer (2003) [51]	Assessed with Quality Assessment Tool for Before-After (Pre-Post) Studies with No Control Group (Criteria A)	+	+	+	?	?	+	−	/	?	?	−	−			Fair
Echeburúa (2006) [52]	Assessed with Quality Assessment Tool for Before-After (Pre-Post) Studies with No Control Group (Criteria A)	+	+	+	+	−	+	+	/	+	+	−	/			Good
Puchala et al. (2010) [55]	Assessed with Quality Assessment Tool for Case Series Studies (Criteria D)	+	+	+	+	+	+	+	+	+						Good
Haggård et al. (2015) [57]	Assessed with Quality Assessment Tool of Case Controlled Studies (Criteria C)	+	+	+	+	+	+	/	−	+	+	+	+			Good
Echauri et al. (2013) [58]	Assessed with Quality Assessment Tool for Before-After (Pre-Post) Studies with No Control Group (Criteria A)	+	+	+	+	+	+	+	/	+	+	+	/			Good

Note. Quantitative studies were assessed using the Quality Assessment Tools published by the National Heart, Lung and Blood Institute (NHLBI) [50]. The criteria for each of the utilised tools have been fully explained in Supplementary Materials S3. Symbols: + = yes; − = no; ? = unclear; / = not applicable.