Table 5 Criteria for high-quality trials
| Â | Linde (1997) [6] | Shang (2005) [9] | ||
|---|---|---|---|---|
Name of quality instruments | Jadad score | Internal Validity scale | [Not stated] | Cochrane risk-of-bias appraisal tool (RoB 1) |
Quality components* (1: used; 0: not used) | ||||
 1. Generation of allocation sequence adequate | 1 | 1 | 1 | 1 |
 2. Allocation concealment adequate | 0 | 1 | 1 | 1 |
 3. Double-blinding adequate | 1 | 0 | 1 | 0 |
 4. …Blinding of patientsa | 0 | 1 | 0 | 1a |
 5. …Blinding of evaluators | 0 | 1 | 0 | 1 |
 6. Baseline comparability adequate | 0 | 1 | 0 | 0 |
 7. No selection bias after randomisation | 0 | 1 | 0 | 0 |
 8. Completeness of outcome data | 0 | 0 | 0 | 1 |
 9. Dropout/withdrawals described | 1 | 0 | 0 | 0 |
 10. Intention-to-treat analysis | 0 | 0 | 1 or 0 | 0 |
 11. Statistical analysis adequate | 0 | 1 | 0 | 0 |
 12. No selective outcome reporting | 0 | 0 | 0 | 1 |
 13. No other sources of bias | 0 | 0 | 0 | 1 |
 N different quality components |  | 8b | 3 or 4 | 7 |