Lim‐Ashworth 2013.

Study characteristics
Methods	Design: parallel trial Comparison: omega‐3 PUFA vs placebo vs omega‐3 PUFA plus social skills vs placebo plus social skills
Participants	Inclusion criteria: 1. children and adolescents aged 9 to 16 years; 2. who had been diagnosed with ADHD Exclusion criteria: not stated Number of participants: 39 Mean age: not stated Gender: not stated ADHD subtypes: not stated Using ADHD drugs at baseline: not stated Baseline scores: not stated Setting: Singapore, year/s not stated Funding: not stated
Interventions	Intervention Omega‐3 PUFA (no. of participants not stated): not described, and duration unclear, although it appears to be 6 months Omega‐3 PUFA + social skills (no. of participants not stated): not described, and duration unclear, although it appears to be 6 months Control Placebo (no. of participants not stated): not described, and duration unclear, although it appears to be 6 months Placebo + social skills (no. of participants not stated): not described, and duration unclear, although it appears to be 6 months
Outcomes	ADHD symptoms measured at 3 and 6 months Child Behavior Checklist (CBCL) ‐ parent Conners Parent Rating Scale ‐ parent Behaviour at 3 and 6 months CBCL ‐ parent Conners Parent Rating Scale ‐ parent
Notes	Outcome data were not reported.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Comment: not described
Allocation concealment (selection bias)	Unclear risk	Comment: not described
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Comment: not described
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Comment: not described
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Comment: not described; loss to follow‐up: not stated (39 enroled)
Selective reporting (reporting bias)	Unclear risk	Comment: Outcome data were not reported
Other bias	Unclear risk	Comment: inadequate information