Whilst, no doubt, as a matter of lay inference, it could be said that the plaintiff's involvement in such activities outside his work could have created a situation in which he may have sustained some such back injury, in the absence of any expert evidence and in the absence of any lay evidence as to any such incident or series of incidents on his part, that hypothesis seems to be very much a speculative hypothesis.
36 I do not read that passage as indicating that the primary judge reversed the onus of proof in relation to causation. Given that the primary judge accepted the respondent's evidence that he complained about problems with his back connected with the lifting of the frames, and apparently rejected the evidence of Mr. Mann that he sought to be relieved from lifting frames because of stiffness from his gym work, the primary judge was entitled to infer causation; and I would not read the passage quoted as doing any more than raising factors relevant to the question whether he should draw the inference of causation in the respondent's favour. Similarly, on the basis that the respondent's evidence was accepted, I do not think the absence of reference in the medical evidence, apart from that from Dr. Millons, to the weight-training was of great significance.
37 However, if the respondent's evidence had not been preferred to Mr. Ali and Mr. Mann, it is very doubtful that the inference of causation could have been drawn. If the truth was that the respondent made no complaint about lifting affecting his back to Mr. Ali or Mr. Mann, but did complain about problems with lifting resulting from his gym work, then in my opinion it would have been necessary for the question of causation to be addressed by the medical witnesses, having regard to that set of circumstances; and of course, that was not done.
38 Turning to the third question, the evidence of the safety and risk management expert was based on incorrect assumptions. At no time did the respondent work 13 hours a day. In the first of the three weeks when he was working on the paint line, it appears that he worked for 10 hours and 25 minutes on three days and for lesser times on two days. However, in the second of those weeks he worked for 8 hours and 25 minutes on each of three days and did not work on any of the other four days. On the third of those three weeks, he worked for five hours one day, 8 hours and 25 minutes another day, and 9 hours and 25 minutes on a third day, and did not work on the other four days. In the week before he was off work for ten days, he only worked two days, one for five hours and one for 7.9 hours. On the following week, he worked one day before his ten days off work, for 6 hours and 25 minutes. On the two days that he worked after coming back from his ten days off work, he worked for 8 hours and 5 minutes and 8 hours and 25 minutes. The frames that he was lifting did not weigh between 20 and 50kgs, and generally about 30kgs but, on the primary judge's findings, between about 7 and 11kgs. He was loading individual frames onto hooks, perhaps 40 or 50 times an hour, and it would seem taking individual frames off hooks 40 to 50 times an hour; but the carrying of stacks of frames, which the primary judge found to be the cause of his problems, only occurred once or twice per hour. As far as the evidence went, when he carried stacks of 40kgs, he stood up inside the frames and lifted them with his arms on either side of him. The primary judge's finding of carrying significant weights on a regular basis did not, in the light of the expert's report, justify a conclusion that the system of work was unsafe.
39 For those reasons, in my opinion the finding on liability should be set aside. It is possible that, if the respondent were to be completely accepted, a finding of negligence might be justified, and so, but for my views on damages, I would have ordered a new trial.
40 However, in relation to damages, the finding of one-third of a most extreme case was in my opinion plainly excessive. On the primary judge's finding, the respondent did have a condition which would limit the jobs available to him, and could give rise to periods of unemployment, this in turn having some bearing on his enjoyment of life. There was evidence of some continuing pain, albeit adequately controlled by medication. There was a possibility that his condition could worsen, but also a possibility that it could resolve. A factor in favour of a significant award for non-economic loss was the circumstance that he was young and had his whole adult life in front of him.
41 However, when one has regard to the vigorous activities that he was undertaking, including weight-training, kick-boxing and disco-dancing, it is in my opinion impossible to regard his condition as being anything approaching one-third of a most extreme case. In my opinion, that assessment is well outside the range open to the primary judge. In my opinion, were this Court assessing damages at this stage, it would be appropriate to assess the respondent's non-economic loss at 15% of a most extreme case. That would be insufficient to pass the threshold for non-economic loss, much less the higher threshold for economic loss. For that reason, in my opinion there should not be a new trial ordered, but a verdict entered for the appellant.