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Newcastle–Ottawa scale scores for the observational studies.
| Study | Selection (0 to 4 *) |
Comparability (0 to 2 *) | Outcome (0 to 3 *) |
Total | Quality Assessment |
|---|---|---|---|---|---|
| Jackson | 3 * | 2 * | 2 * | 7 * | Good |
| Weisz | 3 * | 2 * | 3 * | 8 * | Good |
*: stars awarded for each numbered item within the Selection, Comparabilty and Outcome categories according to the Newcastle-Ottawa quality assessment form for cohort studies [26].
