Table 1 : Assessment of level of evidence.

Level of evidence Narrow descriptor Broader descriptor Description of study

5 Strong Substantial Validated scores & magnitude of effect assessed
4 Moderate Validated scores but no magnitude of effect assessed
3 Mild   Magnitude of effect assessed but no validated scores
2 Weak Less substantial No validated scores or assessment of magnitude of effect
1 Indication only Descriptive study

Fairthorne et al.Journal of Autism  2018 5:1DOI : 10.7243/2054-992X-5-1