Ralston 2013.

Methods	Country: USA Setting: hospital RCT
Participants	Tobacco smoking caregiver over 18 years of age with a hospitalised child
Interventions	Intervention: brief intervention recommending tobacco cessation followed by referral to the state tobacco quit line and receipt of a smoking cessation brochure produced by the American Cancer Society. Both groups received an age‐appropriate injury prevention brochure.
Outcomes	Primary outcome: Self‐reported quit status (defined as self‐reported abstinence for at least 1 week) Secondary outcomes: Decrease in cigarettes smoked per day; increase in importance of quitting on a 1 to 10 scale; report of any contact with state quit line
Type of intervention	Child with health problems (ill‐child health care)
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Random numbers computer generated
Allocation concealment (selection bias)	Low risk	Sequential sealed envelopes used
Incomplete outcome data (attrition bias) All outcomes	High risk	High level of loss to follow‐up (N = 19/60; 32%). However, ITT analysis was performed, and those lost to follow‐up were treated as ongoing smokers.
Blinding of outcome assessment (detection bias) All outcomes	High risk	Telephone interviewers were not always blinded (but did have a script).