Table 2 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 | Jadad Score(5-point) |
|---|---|---|---|---|---|---|---|---|
Itoh Y 2011 | B | B | A | 6 | NO | Student’s t-test | B | 3 |
Tsuzaka Y 2011 | B | B | A | 10 | NO | Student’s t-test | B | 3 |
Guptas S 2013 | A | B | A | 0 | NO | Student’s t-test | A | 4 |
Dell'Atti L 2014 | B | A | A | 3 | YES | Student’s t-test | A | 4 |
Sur RL 2014 | A | A | A | 6 | YES | Wilcoxon test | A | 5 |
Kumar S 2015 | A | A | A | 6 | YES | chi-square test | A | 5 |