Chan 2005.

Methods	Country: Hong Kong, China Setting: hospital (paediatric wards/outpatient settings) Type: RCT
Participants	80 parents of sick children presenting to a clinic or admitted to a children’s ward of a major Hong Kong hospital
Interventions	Intervention: individualised motivational intervention for 30 minutes with nurse counsellor; appropriate stage‐matched intervention used to "increase motivation and lower resistance to quit"; telephone reminder 1 week after the intervention Control: healthy diet counselling for their sick children as a placebo intervention
Outcomes	One‐month follow‐up: • Parent report of daily cigarette consumption in past 30 days
Type of intervention	Child with health problems (ill‐child health care)
Notes	Retention: 77/80
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	"Randomized controlled trial"; no further information provided
Allocation concealment (selection bias)	Unclear risk	Randomised after completion of questionnaire; no further information provided
Incomplete outcome data (attrition bias) All outcomes	Low risk	Low loss to follow‐up: 77 (of 80) participants followed‐up successfully
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	"At 1 month, trained interviewers who were blinded to the group assignment delivered telephone follow‐up calls to both groups to evaluate the primary and secondary outcomes using a standardized questionnaire." Self‐reported outcome only; bias possible