NCT01807299.

Study characteristics
Methods	Design: parallel trial Comparison: omega‐3 PUFA + physical training vs placebo + physical training
Participants	Inclusion criteria: 1. children aged 7 to 14 years with ADHD; 2. boys; 3. sedentary; 4. studying in a regular school Exclusion criteria: 1. taking psychoactive medications; 2. taking omega supplement Number of participants: 53 (47 completed) Mean age: 10.51 years Gender: all 53 participants were male ADHD subtypes: not stated Using ADHD drugs at baseline: 0% Baseline Conners scores: omega‐3 = 36.64; omega‐3 + physical training = 36.82; control = 42.31; control + physical training = 40.08 Setting: school, Brazil, year/s not stated Funding: not stated
Interventions	Intervention (22 participants): capsules of omega‐3, 2 g per day of fish oil for 90 days +/‐ physical training Control (25 participants): 2 g per day of mineral oil +/‐ physical training for 90 days
Outcomes	ADHD symptoms at 3 months (rater not stated) Conners Rating Scale
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Not reported
Allocation concealment (selection bias)	Unclear risk	Not reported
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Not stated
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not stated
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Not stated
Selective reporting (reporting bias)	Low risk	All relevant outcomes were reported
Other bias	Unclear risk	PUFA and control groups were similar for age, gender ethnicity and baseline scores