Table 2.
Quality appraisal of included studies
| Was the sample used in the study appropriate to its research question? | Were the data collected appropriately? | Were the data analysed appropriately? | Can I transfer the results of this study to other settings? | Does the study adequately address potential ethical issues, including reflexivity? | Overall: is what the researchers did clear? | |
|---|---|---|---|---|---|---|
| Butler [16] |
Yes |
Yes |
Yes |
Yes |
No |
Yes |
| Cals [17] |
Yes |
Yes |
Yes |
Yes |
No |
Yes |
| Cals [18] |
Yes |
Yes |
Yes |
Yes |
No |
Yes |
| Gillam [19] |
Unclear |
Unclear |
Unclear |
Unclear |
No |
No |
| Glover [20] |
Unclear |
Yes |
Yes |
Unclear |
No |
Yes |
| Stone [21] |
Yes |
Yes |
Yes |
Yes |
No |
Yes |
| Wood [22] | Yes | Yes | Yes | Yes | No | Yes |