Double-layered covered stent for the treatment of malignant oesophageal obstructions: Systematic review and meta-analysis

Table 1 Design and patient characteristics of included clinical trials

Publication	Study design	Sample (n)	Age (yr)	Male gender	Adenocarcinoma	Distal esophagus	Tumour length (cm)
Verschuur et al[16], 2006	Prospective	42	65 ± 14	60%	76%	21%	7.8 ± 2.4
	cohort
Kim et al[13], 2009	Prospective	17	68 ± 8	94%	33%	39%	6.1 ± 2.6
	randomized
Park et al[15], 2010	Prospective	32	67 ± 9	75%	N/A	53%	N/A
	cohort
Battersby et al[12], 2012	Prospective	55	72	67%	56%	93%	11.7 ± 2.5
	cohort						(stent length)
Kim et al[14], 2012	Prospective	48	68 ± 11	81%	33%	37%	N/A
	cohort
Mezes et al[11], 2014	Retrospective	56	N/A	61%	38%	55%	N/A
	cohort

N/A: Not available.