Monforton, C (2010) An impact evaluation of a federal mine safety training regulation on injury rates among US stone, sand, and gravel mine workers: an interrupted time‐series analysis.
Country	US
Aim	Assess impact of the mandatory worker safety policy and training regulations issued Sept 1999 by US MSHA (Mine Safety and Health Administration) on injury rates
Target population	Occupation: Mine workers‐ stone, sand, gravel/dynamic
	Industry: B—Mining and quarrying
	Setting: 010 Industrial site
	Firm size: Mixed firm size
Study design	ITS with comparison conditions: 5. Serial measures with stratified analyses (allowing comparisons)
	Unit of analysis: Group/organizational level
	Sample size: 7998 mines reporting person‐hours of work to allow quarterly rate calculations.
Type of intervention	2.2.1 Legislative changes
Evaluation design	Duration of intervention: Permanent requirement changed for training with one year phase in period (Government regulation)
	Duration of follow‐up: 4 = Long‐term (>36 months)
	Type of outcome measure: Injury
Study quality	High quality