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

Table 1 Description of studies included in the meta-analysis

Ref.	Country	Number of patients (n)	Bowel preparation times (dose 1)	Patients per group (n)	Bowel preparation scale	Satisfactory bowel preparations (n)	OBPS (mean score ± SD)
Parra-Blanco et al[16], 2006	Spain	88	Same day PEG 3 L	43	Ottawa	34	ND
			Split-dose NaP 45 mL/45 mL	45	Ottawa	36	ND
Kang et al[24], 2014	South Korea	196	Same day NaP 1/1	97	Ottawa	59	4.05 ± 1.56
			Split-dose PEG 2 L/2 L	99	Ottawa	71	3.8 ± 1.55
Shah et al[17], 2014	India	159	Same day PEG 2 L	80	Ottawa	ND	6.02 ± 1.34
			Split-dose PEG 1 L/1 L	79	Ottawa	ND	5.52 ± 1.23
Cesaro et al[18], 2013	Italy	101	Same day Halflytely 2 L/10-20 mg Bisacodyl	50	Ottawa	ND	2.78 ± 1.95
			Split-dose PEG 3 L/1 L	51	Ottawa	ND	3.41 ± 1.90
de Leone et al[19], 2013	Italy	154	Same day Halflytely 2 L/10-20 mg Bisacodyl	78	Ottawa	70	3.09 ± 2.4
			Split-dose PEG 2 L/2 L	76	Ottawa	70	2.39 ± 2.55
Kim et al[25], 2014	South Korea	100	Same day PEG 4 L	50	Ottawa	41	4.98 ± 1.78
			Split-dose PEG 2 L/2 L	50	Ottawa	42	4.98 ± 1.57
Kotwal et al[20], 2014	United States	103	Same day PEG 3 L	51	Ottawa	ND	7.15 ± 3.58
			Split-dose PEG 2 L/2 L	52	Ottawa	ND	7.38 ± 3.65
Seo et al[21], 2013	South Korea	197	Same day PEG 2 L	97	Ottawa	72	3.76 ± 2.07
			Split-dose PEG 2 L/2 L	100	Ottawa	75	3.67 ± 1.57
Zhang et al[23], 2014	China	318	Same day PEG 2 L	159	Ottawa	126	4.4 ± 2.7
			Split-dose PEG 1 L/2 L	159	Ottawa	143	2.9 ± 2.4
Alkhairi et al[26], 2017	United States	300	Same day PEG 4 L	142	Ottawa	142	ND
			Split-dose PEG 2 L/2 L	158	Ottawa	156	ND
Castro et al[22], 2019	United States	130	Same day PEG 4 L	65	Ottawa	34	ND
			Split-dose PEG 2 L/2 L	65	Ottawa	31	ND

OBPS: Ottawa bowel preparation score; PEG: Polyethylene glycol; ND: Not detected.