Colonic stenting vs emergent surgery for acute left-sided malignant colonic obstruction: A systematic review and meta-analysis

Table 1 Randomized controlled trials involved in the meta-analysis

Year	Author	Region	Total	SEMS	Surgery	Concealment of allocation	Jaded score	Quality
2009	Cheung	Hongkong	60	30	30	Appropriant	5	High
2010	Pirlet	France	48	24	24	Appropriant	5	High
2011	Van Hooft	Holland	98	47	51	Appropriant	5	High

SEMS: Self-expandable metallic stent.

Table 2 Basic characteristics of included nonrandomized controlled studies in the meta-analysis

Year	Author	Design	Total	SEMS	Surgery	Match	Study quality (rate, max 11)
2008	Dastur	R	43	19	23	1,2,3,4,5,6	8
2002	Martin	R	52	26	26	1,2,3,4,5,8	7
2006	Ng	R	60	20	40	1,2,3,5,6,8	8
2007	Pessione	R	16	9	7	1,2,3,4,5,8	7

Matching: 1 = age, 2 = sex, 3 = diagnosis, 4 = tumor site, 5 = tumor stage, 6 = American Society of Anesthesiologists score, 7 = body mass index, 8 = comorbidity. SEMS: Self-expandable metallic stent. “R” represents that the study was a randomized clinical trail.