Daltroy, LH (1997) A controlled trial of an educational program to prevent low back injuries.
Country	US
Aim	To evaluate an educational program designed to prevent low back injury.
Target population	Occupation: Postal and courier activities
	Industry: H—Transporting and storage
	Setting: 060 Public area
	Firm size: 250+ (large)
Study design	RCT with comparison conditions: TAU (Treatment as usual)
	Unit of analysis: Group/organizational level
	Sample size: approximately 4000 US postal workers. Unit of analysis was the work unit.
Type of intervention	1.2.4 Individual feedback or coaching
Evaluation design	Duration of intervention: Not reported or unclear
	Duration of follow‐up: 4 = Long‐term (>36 months)
	Type of outcome measure: Injury
Study quality	High quality