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 |
|---|---|---|---|---|---|---|---|---|
| (11) | A | A | B | 0 | Yes | ANCOVA | A | NO |
| (6) | A | A | B | 0 | Yes | ANCOVA | A | NO |
| (12) | A | A | B | 0 | Yes | ANCOVA | A | NO |
| (8) | A | A | A | 0 | Yes | ANCOVA | A | Yes |
| (9) | A | A | B | 0 | Yes | ANCOVA | A | NO |
| (10) | A | A | B | 0 | Yes | ANCOVA | A | NO |
| (7) | A | A | B | 3 | Yes | ANCOVA | A | NO |
A, all quality criteria met (adequate): low risk of bias; B, most quality criteria met (adequate): moderate risk of bias; ITT, intention to treat; ANCOVA, analysis of covariance.