Slusser 2012.

Study characteristics
Methods	Study design: RCT Intervention period: 17‐weeks (10 cohorts over 17 months) Follow‐up period (post‐intervention): 35 weeks Differences in baseline characteristics: reported Reliable outcomes: reported Protection against contamination: NR Unit of allocation: individual Unit of analysis: individual
Participants	N (control baseline) = 80 N (control follow‐up) = 37 N (intervention baseline) = 80 N (intervention follow‐up) = 44 Setting (and number by study group): healthcare clinic preschools including Head start, family centre and Children’s Bureau serving low‐income predominantly Latino families Recruitment: at clinic visits or in classrooms of community sites (Latino with at least 1 child 2‐4 years) Geographic region: Los Angeles, USA Percentage of eligible population enrolled: 100% Mean age: intervention + control: 2‐4 Sex: intervention: 55.7% female; control: 56.7% female
Interventions	To examine the effectiveness of a multicomponent parent training programme on the prevention of overweight and obesity among Latino children aged 2‐4 Parent training intervention to promote optimal nutrition and PA. Used a bilingual social worker as a facilitator for the classes. 7 x 90‐min weekly modules and 2 booster sessions, 1/month after the end of the 7 weeks and final booster session a month later. Included parent homework. Wait list control group Diet and PA combination intervention vs control
Outcomes	Outcome measures Primary outcome: zBMI Secondary outcomes: BMI percentile Process evaluation: NR
Implementation‐related factors	Theoretical basis: Social Learning theory Resources for intervention implementation: reported Who delivered the intervention: reported PROGRESS categories assessed at baseline: child, race/ethnicity; parent: race/ethnicity, marital status, SES (health insurance) PROGRESS categories analysed at outcome: NR Outcomes relating to harms/unintended effects: NR Intervention included strategies to address diversity or disadvantage: culturally modified Economic evaluation: NR
Notes	Funding: study was funded by the generous gifts of: Joseph Drown Foundation, Simms/Mann Family Foundation, and Venice Family Clinic. Study analyses focuses on subset of children with a BMI > 50th percentile at baseline
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Stratified by gender and BMI percentile and randomly assigned using computer program
Allocation concealment (selection bias)	Low risk	Stratified by gender and BMI percentile and randomly assigned using computer program
Blinding (performance bias and detection bias) All outcomes	Low risk	The current paper reports the results of anthropometric assessments comparing t1 and t3 with t3 measurements administered by an assessor who was not aware of group assignment.
Incomplete outcome data (attrition bias) All outcomes	High risk	21% and 29% attrition (intervention and control respectively), also excluded from analysis all children with baseline BMIs < 50th percentile (24% intervention and 25% control). There was differential dropout in this subset that was accounted for in the analyses.
Selective reporting (reporting bias)	Unclear risk	Protocol or trial register not found
Other bias	Low risk	No additional threats to validity