Table 3 Quality assessment of individual study
Study | Allocation sequence generation | Allocation concealment | Blinding | Loss to follow-up | Calculation of sample size | Statistical analysis | Level of quality | ITT analysis |
|---|---|---|---|---|---|---|---|---|
Hong et al. (2010) [20] | A | A | B | 3 | Yes | Mann-Whitney U-test; Chi-square test | A | No |
Joo et al. (2012) [21] | A | A | B | unmentioned | Yes | Student’s t-test; Pearson’s x2-test | A | No |
Roehrborn et al. (2014) [22] | A | A | B | unmentioned | Yes | Mann-Whitney U-test; Chi-square test; T-tests | A | Yes |
Roehrborn et al. (2015) [23] | A | A | B | 16 | Yes | T-tests | A | Yes |
Choi et al. (2016) [24] | A | A | B | 17 | No | Mann-Whitney U-test | A | No |