Acupuncture Therapy for Functional Effects and Quality of Life in COPD Patients: A Systematic Review and Meta-Analysis

Table 2

Risks of bias of included studies.

Study	Random sequence generation	Allocation concealment	Blinding of participants and personnel	Blinding of outcome assessment	Incomplete outcome data	Selective reporting	Other biases
Chu and Cai [7] 2015	U	U	H	U	L	U	H
Deering et al. [8] 2011	L	U	H	L	U	U	H
Deng et al. [9] 2016	U	U	H	U	L	U	H
Feng et al. [10] 2016	L	L	L	L	L	U	L
Gao et al. [11] 2011	L	U	H	U	L	U	L
Hu [12] 2016	U	U	H	U	L	U	L
Jia [13] 2004	L	U	H	U	L	U	L
Li [14] 2015	L	U	H	U	L	U	H
Li et al. [15] 2016	L	L	H	U	L	U	L
Liu et al. [16] 2015	U	U	H	U	L	U	H
Suzuki et al. [17] 2012	L	U	L	L	L	U	L
Tong et al. [18] 2014	L	L	L	L	L	U	L
Wan et al. [19] 2009	U	U	H	U	L	U	L
Xie and Yu [20] 2014	L	U	H	U	L	U	L
Yang et al. [21] 2009	H	U	H	U	L	U	H
Yu [22] 2014	L	U	H	U	L	H	L
Ge et al. [23] 2017	L	U	L	U	L	U	L
Shi [24] 2017	L	U	H	U	L	U	H
Tang [25] 2017	L	U	H	U	L	U	H

Notes. Quality assessment based on the Cochrane tools for assessing risk of bias. L: low (low risk of bias), H: high (high risk of bias), U: unclear (uncertain risk of bias).