What is the test for determining whether a disability is a result of multiple causes?

British Columbia, Canada


The following excerpt is from WCAT-2016-00289 (Re), 2016 CanLII 17884 (BC WCAT):

If a disability results from the interaction of multiple causes, it is improper to require that the compensable event or injury be the most significant factor. It is sufficient if the employment or injury was a significant contributing factor, or contributed to a material degree to the disablement (Professor Ison’s Workers’ Compensation in Canada (2nd Edition), at page 58; Athey v. Leonati, 1996 CanLII 183 (SCC), [1996] 3 S.C.R. 458) (Athey).

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