Table 2 Quality evaluation of the six studies included in the meta-analysis
Study | Sample description | Method error analysis | Adequacy of statistics | Previous estimate of sample size | Blinding in measurements | Quality score | Judged quality standard |
|---|---|---|---|---|---|---|---|
Başaran et al. [23] | Full | No | Partial | No | No | 3 | Low |
Chen et al. [28] | Full | Full | Partial | No | No | 5 | Medium |
Sukhia and Fida [31] | Full | Full | Partial | No | No | 5 | Medium |
Różyło-Kalinowska et al. [30] | Full | No | Partial | No | No | 3 | Low |
Perinetti et al. [20] | Full | Full | Full | No | Yes | 7 | High |
Kumar et al. [29] | Full | Full | Partial | No | No | 5 | Medium |