The Safety and Efficiency of Surgery with Colonic Stents in Left-Sided Malignant Colonic Obstruction: A Meta-Analysis

Table 1

Bias risk profile and score of Jadad scale.

(a) Bias risk profile

Author	Randomized trial (selection bias)	Allocation concealment (selection bias)	Blind selection (performance bias)	Blind evaluation (measurement bias)	Data deficient (attrition bias)	Literature quality
Alcántara et al. [1]	−	−	o	+	−	High
Cheung et al. [2]	−	−	o	+	−	High
Ho et al. [3]	−	−	o	o	−	High
Pirlet et al. [4]	−	−	o	+	−	High
van Hooft et al. [5]	−	−	o	o	−	High

Note: +: high risk, o: not available, and −: low risk.

(b) Score of Jadad scale

Author	Generation of random sequence	Randomization concealment	Double-blind performance	Exit and attrition	Total
Alcántara et al. [1]	2	1	0	1	4
Cheung et al. [2]	2	1	0	1	4
Ho et al. [3]	2	1	0	1	4
Pirlet et al. [4]	2	1	0	1	4
van Hooft et al. [5]	2	1	0	1	4

Note: 1–3: low quality; 4–7: high quality.