Prokhorov 2013.

Methods	Country: USA Setting: home RCT
Participants	Households with a child younger than 18 years of age and 2 adults, 1 of whom was a smoker
Interventions	One culturally appropriate bilingual comic book for children and 2 fotonovelas for adults
Outcomes	Reduced household smoking ‐ report and 2 nicotine air sampling monitors Self‐reported smoking status given (for the smoker) Increase in knowledge of health effects of SHS
Type of intervention	Well‐child (child health check)
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Method of randomisation not specified
Allocation concealment (selection bias)	Unclear risk	Not stated
Incomplete outcome data (attrition bias) All outcomes	High risk	76 of 91 households completed 12 months of follow‐up; no ITT analysis stated
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Environmental nicotine monitors as outcome
Other bias	High risk	No ITT analysis. Air nicotine levels higher in intervention group but not significantly so