Split-dose vs same-day bowel preparation for afternoon colonoscopies: A meta-analysis of randomized controlled trials

Table 2 Quality assessment of studies included in meta-analysis based upon Cochrane’s Collaboration Risk of Bias tool

Ref.	Study design	Random sequence generation	Allocation concealment	Blinding	Blinding outcome assessment	Incomplete outcome data	Selective reporting	Other bias	Quality assessment
Parra-Blanco et al[16], 2006	RCT	Adequate	Adequate	Single-blinded	Adequate	None	None	None	High
Kang et al[24], 2014	RCT	Adequate	Adequate	Single-blinded	Adequate	None	None	None	High
Shah et al[17], 2014	RCT	Adequate	Adequate	Single-blinded	Adequate	None	None	None	High
Cesaro et al[18], 2013	RCT	Adequate	Adequate	Single-blinded	Adequate	None	None	None	High
de Leone et al[19], 2013	RCT	Adequate	Adequate	Single-blinded	Adequate	None	None	None	High
Kim et al[25], 2014	RCT	Not described	Adequate	Single-blinded	Adequate	None	None	None	Moderate
Kotwal et al[20], 2014	RCT	Adequate	Adequate	Single-blinded	Adequate	None	None	None	High
Seo et al[21], 2013	RCT	Adequate	Adequate	Single-blinded	Adequate	None	None	None	High
Zhang et al[23], 2014	RCT	Adequate	Adequate	Single-blinded	Adequate	None	None	None	High
Castro et al[22], 2019	RCT	Adequate	Adequate	Single-blinded	Adequate	None	None	None	High
Alkhairi et al[26], 2017	RCT	Not described	Not described	Single-blinded	Adequate	None	None	None	Moderate

RCT: Randomized controlled trial.