Table 1.

Quality assessment of the publications included in this study using the modified Jadad scale.

	Randomization			Allocation concealment				Blinding			Withdrawals/dropouts	Total score
Author(s), year	Adequate	Unclear	Inadequate	Adequate	Unclear	Inadequate	None	Adequate	Unclear	Inadequate or unused	(Yes/no)
Gibbard (1994)		1			1			2			1	5
Girolametto et al. (1996)		1			1			2			0	4
Girolametto et al. (1997)		1			1				1		1	4
Almost and Rosenbaum (1998)	2			2				2			1	7
Robertson and Weismer (1999)		1			1				1		1	4
Glogowska et al. (2000)		1		2						0	1	4
Denne et al. (2005)		1		2					1		1	5
Boyle et al. (2007)		‘			1			1			1	4
Gallagher and Chiat (2009)		1					0	2			1	3
Ebbels et al. (2012)	2				1			2			1	6
Smith-Lock et al. (2013)			0		1	0		2			1	4
Wake et al. (2013)	2			2				2			1	7
Buschmann et al. (2015)	2			2				2			1	7
Roberts and Kaiser (2015)	2			2						0	1	5
Lee and Pring (2016)		1			1			2		1		5
Dawes et al. (2019)		1			1			2			0	4
Hampton et al. (2017)	2			2						1	1	6
Kruythoff-Broekman et al. (2019)		1					0			0	1	2