Work-attributed illness arising from excess heat exposure in Ontario, 2004-2010.

Objective: To describe the incidence of occupational heat illness in Ontario.

Methods: Heat illness events were identified in two population-based data sources: work-related emergency department (ED) records and lost time claims for the period 2004-2010 in Ontario, Canada. Incidence rates were calculated using denominator estimates from national labour market surveys and estimates were adjusted for workers' compensation insurance coverage.