Olds 1994.

Methods	RCT
Participants	Primiparous women registering before the 26th week of pregnancy from upstate New York, <19 years of age, single parents, or low socio‐economic status
Interventions	I1 = families were provided with a home nurse visitor during pregnancy in addition to screening and transportation services I2 = as I1 but the nurse continued to visit until the child was 2 years of age C1 = screening for sensory and developmental problems C2 = free transportation for regular prenatal and well child care clinics
Outcomes	Outcomes measured at 34 and 46 months: Safe storage of poisonous substances ‐ no significant difference. No figures or P values reported Hazard score comprising exposure to hazards in the home At 34 months: log incidence of hazardous exposures I2 = ‐1.75, C1 + C2 = ‐1.04, P = 0.04 At 46 months: log incidence of hazardous exposures I2 = ‐1.94, C1 + C2 = ‐0.83, P = 0.003
Notes	Blinding ‐ y Outcomes 80% ‐ y Balance ‐ n/a
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	Unclear