Table 3. Cochrane Risk of Bias Tool¹⁶.

Article	Selection Bias		Performance Bias	Detection Bias	Attrition Bias	Reporting Bias	Other Bias	Total
	Random Sequence Generation	Allocation Concealment	Blinding of Participants and Personnel	Blinding of Outcome Assessment	Incomplete Outcome Data	Selective Reporting	Anything Else, Ideally Prespecified	Low on Risk of Bias
Andersson (1992)9	Low	Unclear	High	High	Low	Low	Low	5/7
Raudaskoski (1995)10	Low	Low	High	Low	Low	Low	Low	6/7
Antoniou (1997)11	Low	Unclear	High	Low	Low	Low	Low	6/7
Suvanto-Luukkonen (1998)12	High	Unclear	High	Low	Low	Low	Low	5/7
Wollter-Svensson (2001)13	Low	Low	High	Low	Low	Low	Low	6/7
Raudaskoski (2002)14	Low	Low	Low	Unclear	High	Low	Low	6/7
Boon (2003)15	Low	Low	Low	Low	Unclear	Low	Low	7/7
Wildemeersch (2005)16	High	High	High	High	Low	Low	High	2/7
Wildemeersch (2007)17	High	High	High	High	Low	Low	High	2/7
Hampton (2005)18	High	High	High	High	Low	Low	Low	3/7
Varila (2001)19	High	High	High	High	Low	Low	Low	3/7