Table 3.
Jadad scale for quality assessment
| Items | Scoring the items | Kalman et al. [21] | Zenk et al. [20] | Zenk et al. [3] | Zenk et al. [5] |
|---|---|---|---|---|---|
| 1) Was the study described as randomized? | Yes (1 point)/no (0 point) | Yes | Yes | Yes | Yes |
| 2) Was the study described as double blind? | Yes (1 point)/no (0 point) | Yes | Yes | Yes | Yes |
| 3) Was there a description of withdrawals and dropouts? | Yes (1 point)/no (0 point) | Yes | Yes | Yes | Yes |
| 4) Was the randomization appropriate? | Yes (1 point)/no (-1 point) | Yot reported | Yes | Yes | Yes |
| 5) Was the double-blinding appropriate? |
Yes (1 point)/ no (-1 point) |
Yes | Yes | Yes | Yes |
| Total score | 4 | 5 | 5 | 5 |