'Substantial contributing factor' in s 9A of the Workers Compensation Act 1987 (NSW) means that the causal connection between the employment and the injury must be 'real and of substance'; it does not require the connection to be 'large', 'weighty' or 'predominant'. The s 9A test is not less stringent than the 'arising out of employment' test in ss 4 and 9, contrary to what was held in Mercer v ANZ Banking Group. Section 9A(2)(b) directs attention to the nature of the work performed in the employment generally, not to what the employee was doing at the actual moment of injury.
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