Review Article
The Effect of Qigong on Depressive and Anxiety Symptoms: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
Table 2
Quality assessment of the included studies.
| | Studies | Randomization
employed | Randomization methods | Inclusion and exclusion criteria | Outcome assessors blinded | Withdrawal and dropouts | Sample size estimation | Intention-
to-treat analysis | Intervention described | Qualification of the trainer |
| | Chan et al., 2012 [28] | Y | N | Y | Y | Y | N | Y | Y | Y | | Chan et al., 2011 [29] | Y | Block randomization | Y | Y | N | Inappropriate* | NA | Y | Y | | Cheung et al., 2005 [30] | Y | A randomization list prepared by a statistician | Y | N | Y | Y | Y | Y | Y | | Liu et al., 2012 [31] | Y | Random digit number table | Y | N | Y | N | N | Y | Y | | Ma et al., 2011 [32] | Y | N | Y | N | N | N | NA | Y | N | Qiu, 2011
[33] | Y | Random digit number table | Y | N | N | N | NA | Y | Y | |
Tsang et al., 2003 [37] | Y | Drawing of lots | Y | N | Y | Y | Y | Y | Y | |
Stenlund et al., 2009 [34] | Y | Computer-generated number | Y | Y | Y | N | Y | Y | Y | | Tsang et al., 2012 [35] | Y | N | Y | Y | Y | Y | N | Y | Y | | Tsang et al., 2006 [36] | Y | N | N | N | N | N | NA | Y | Y | | Wang et al., 2010 [38] | Y | N | N | N | N | N | NA | Y | N | | Wang, 2008 [39] | Y | Computer-generated number | Y | N | Y | N | N | Y | Y |
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N: not reported; NA: not applicable; Y: yes. *Sample size was not calculated according to power and effect size.
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