Table 7:

Safety Incidents Comparison by Exposure and Intervention Usage Groups

Measure	Exposure / Intervention Usage Group	All Interventions			Ergonomic Material Handling Only (Anti-fatigue Mats Excluded)
		N Surveys	Mean	Effect of Intervention**	N	Mean	Effect of Intervention**
Any Safety Events Frequency > 0	1	592	4.7%	5.4% (−58%, 164.4%)	554	4.2%	5.7% (−94.6%, 106.1%)
	2	172	9.9%		162	9.9%
	3	56	8.9%		53	9.4%
	4	148	10.1%		146	10.3%
Material Handling Task-related Safety Events Frequency > 0	1	592	3.0%	−15.2% (−66.2%, 112.8%)	554	2.5%	−9.4% (−91.3%, 72.4%)
	2	172	7.6%		162	8.0%
	3	56	5.4%		53	5.7%
	4	148	8.8%		146	8.9%

^*One company performing seasonal work was excluded.

^**Based on comparing Groups 2 and 4, with 95th percentile confidence intervals shown.