Study designs of evaluations included in the review
Randomised controlled trials (RCTs), non-randomised controlled trials and uncontrolled studies were included.
Specific interventions included in the review
Vitamin B6 with magnesium.
Participants included in the review
Persons with autism were included.
Outcomes assessed in the review
Analysis of urinary homovanillic acid (uHVA); electrophysiological analyses; behavioural measures (Rimland Scale, the Bretonneau Scale and Bretonneau Scales II and III, Autistic Status, the Behaviour Summarised Evaluation, author devised scales).
How were decisions on the relevance of primary studies made?
The authors do not state how the papers were selected for the review, or how many of the authors performed the selection.