Fergusson 1982.

Methods	Non‐randomised controlled trial (C) Allocation at level of 2 month time periods and within time periods sequentially by date of birth
Participants	Families of children aged 2‐3 years participating in the Christchurch Child Development Study
Interventions	I = "Mr Yuk" stickers for poisonous substances + list of substances to which sticker should be attached + educational leaflet provided by researcher C = none of the above
Outcomes	Outcomes measured at 12 months: Medically attended poisonings Mean number of poisons within child's reach I = 14.80, C = 17.70, P > 0.05 Poisoning hazards score I = 79.96, C = 78.29, P > 0.05.
Notes	Blinding ‐ u Outcomes 80% ‐ y Balance ‐ y
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	Not applicable ‐ non‐randomised study