Wickizer, T (2004) Do drug‐free workplace programs prevent occuptional injuries? Evidence from Washington State.
Country	US
Aim	To evaluate the effect of publicly sponsored drug‐free workplace program on reducing the risk of occupational injuries.
Target population	Occupation: Multiple/mixed
	Industry: All or mixed industries
	Setting: 888 All or mixed setting
	Firm size: Mixed firm size
Study design	ITS with comparison conditions: 3. Serial measures with external control
	Unit of analysis: Group/organizational level
	Sample size: 261 intervention companies; 20,500 nonequivalent control companies
Type of intervention	3.3 Multifaceted across individual and organizational levels
Evaluation design	Duration of intervention: Ongoing program in company once initiated
	Duration of follow‐up: 3 = Medium‐term (12–36 months)
	Type of outcome measure: Injury
Study quality	High quality