A contributing factor to a worker's injury that is 'rather minor' or 'minor in comparison with two other substantial factors' is not a 'substantial contributing factor' within the meaning of s 9A(1) of the Workers Compensation Act 1987 (NSW). The word 'substantial' in s 9A requires that the employment contributed to the injury in a manner that is real and of substance, and the section intends to exclude cases where the contribution of employment has little practical substance. The relative weight of the employment factor compared to other causative factors is a finding of fact not readily disturbed on appeal.
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