4 The injuries and disabilities suffered by Mrs Lang were set out in the findings of the Trial Judge's judgment (Red 19, 20 and 21) and can be summarised as follows. The vehicle overturned and Mrs Lang's left arm was trapped under it. She was extricated by emergency services and taken to hospital. After some days she found herself in the Intensive Care Unit at Princess Alexandra Hospital Brisbane. Her hospital treatment included theatre treatment for dressings and debridement, and a significant skin graft using tissue from her right arm and thigh performed on or before 2 September 2000. A fixation device was applied to immobilise her left arm, with pins inserted in the bone. On 16 September 2000 she was transferred to Dubbo Hospital, still with the fixation device on her arm. She had pelvic fractures. She received rehabilitation at Dubbo Base Hospital for about three weeks, and was then transferred to Wellington Hospital on 5 October 2000. An infection developed at the site of fixation of the device, which was removed on 8 November 2000. X-ray on 15 December 2000 established that there had been non-union of fractured bones in her left arm. She was discharged from the hospital on 18 December 2000, but readmitted on 27 December 2000 with lung infection and a collapsed lung as a result of two falls from her wheel chair while showering unassisted. She was again discharged from the Wellington Hospital on 12 January 2001. Consultant Orthopaedic Surgeon Dr Hughes' report showed that her injuries involved pelvis, left facial and orbit fractures, and a closed compound fracture of the left distal humerus. At a review in October 2002 Dr Hughes reported no further recovery in Mrs Lang's left upper limb function; she has effectively a functionless left upper limb. She has purchased a scooter and an electric bed to assist her with mobility. She no longer lives in Wellington but lives in Dubbo.
5 It was accepted by the appellant's doctors that Mrs Lang had suffered: multiple fractures of the hips and pelvis, left facial and orbit fractures, nerve damage to the left arm, flexion deformity of the fingers of her left hand with clawing and a tendency for deformity of the fingers to increase. She has extensive scarring of the legs and arms and permanent impairment of her pelvis, and the fractures of the hips and pelvis are causing ongoing problems. She has some post-traumatic anxiety and depression. She also suffered rib fractures, and has frontal headaches which can last up to two to three days. She sleeps irregularly because of pain and complains of deterioration in her memory and ability to sustain concentration.
6 Mrs Lang has significant pre-existing and intercurrent adverse conditions of health which must be brought under consideration when assessing damages caused by the further severe injuries which she suffered on 4 July 2000. Pre-existing conditions referred to in the judgment of the Trial Judge (Red 17-18) are these. Mrs Lang was born on 2 September 1956 and was almost 43 years of age at the time of injury and 47 at the time of trial. Mrs Lang was diagnosed as a type 2 diabetic in 1976, and she demonstrated a number of significant health problems intercurrent with the effects of the further injuries, including obesity and diabetes mellitus. She suffered from some minor coronary artery disease, and her obesity and diabetes control predisposed her to acceleration of coronary artery disease, and complications of vascular damage, heart attack, stroke and severe circulation problems. Although these pre-existing conditions existed the Trial Judge accepted that Mrs Lang has essentially normal coronary arteries and blood pressure, no signs of renal damage, and her diabetes is well controlled. She also has underactive thyroid, but her diabetes and underactive thyroid are no hindrance to normal activities for a person of her age.
7 The Trial Judge reviewed medical opinions in evidence relating to Mrs Lang's life expectancy. Doctor Slezak, whose evidence was tendered by the appellant, placed Mrs Lang's life expectancy at around 65. Doctor Hammill, whose evidence was tendered by Mrs Lang, was of the view that her life expectancy was to age 70 at least. The Trial Judge, after careful review of this evidence and of appraisal of matters relevant to life expectancy, assessed Mrs Lang's life expectancy as being to age 70. His Honour said that this finding was based on the evidence of Dr Hammill, although it does not exactly accord with Dr Hammill's expressed opinion. This finding was criticised in oral submissions by Senior Counsel for the appellant, in which he contended that there was an error of principle as the Trial Judge treated the question of life expectancy, which of its very nature has to be hypothetical, as being something that could be determined as a matter of certainty.
8 On a reasonable understanding, given the nature of any assessment about a person's life expectancy, a determination on life expectancy could not be understood to be a determination as a matter of certainty. A Court assessing damages is under an obligation to come to a finding and adopt some integer for calculations to which life expectancy is relevant. The Trial Judge reached his finding after a careful review of the evidence of which no criticism in detail was offered, and his Honour reached a conclusion of his own not based on uncritical acceptance of either body of evidence. In my opinion there is no reason to think that the finding was wrong, or that the Trial Judge treated the question as being something that could be determined as a matter of certainty. In my opinion the Trial Judge's approach of making a finding about the life expectancy was not contrary to anything established in Malec v J C Hutton Pty Limited (1990) 169 CLR 638.
9 When making an assessment of damages in relation to Future Economic Loss the Trial Judge's assessment is to be understood from passages in the judgment dealing with Past Economic Loss (Red 23, Schedule of Damages Items 1 and 2), the conclusion on which is not challenged, and further reasons dealing with Future Economic Loss (Red 24-25). Mrs Lang had various employments earlier in life. Her late husband was injured in 1983 and from then on received an invalid pension. Before Mr Lang's injury Mrs Lang was working as a part-time cook for the Wellington Hospital. After his injury she took care of Mr Lang and received a Carer's Allowance, which of course ceased when her husband died. Her opportunity to work was limited because of the need to care for her husband and two young children; if she earned more than $100 a week her Carer's Allowance would be reduced. However she did work part-time, at times cooking or doing housemaid work at hotels, and for some six and a half years in the 1990s she conducted a children's day care. From 1998 to 1999 she worked for a cleaning contractor Mr King, who had a school-cleaning contract in Wellington. She also sometimes worked packing shelves at a supermarket. Her average earnings in the six month prior to her injury were approximately $100 per week, and her school cleaning employment by Mr King was the major contribution to her earnings.
10 In dealing with her Future Economic Loss the Trial Judge found (Red 34) that Mrs Lang now has no practical prospect of exercising any earning capacity. His Honour stated the basis of this finding by reference to passages in medical reports of six different doctors whose opinions supported the finding, in most cases completely and in other cases substantially. Senior Counsel for the appellant pointed to evidence which showed that since her injury Mrs Lang has undertaken and completed a six-months computer course at a Technical College, and contended that this demonstrated the possibility that she could have undertaken some part-time office work in Dubbo. It was further contended that she had the ability to use a computer and to do data entry work, and that it was not unrealistic to suppose that she might find some type of work in a community-based or governmental organisation where her disability would not be a bar to her employment.
11 The submission was put with an assumption that a suitable job was available. There is no evidence that such a position is in fact available. In my view the Trial Judge's finding about Mrs Lang's not having earning capacity is soundly based on medical evidence and on a realistic general understanding of the employment market in relation to Mrs Lang's disability. In my opinion the significance of her undertaking computer training is that it indicates a generally positive approach to employment and the need for skills, which are significant when addressing the probabilities about what she would have done about employment and earnings if she had not been injured. Plainly she has lost all her earning capacity. The damages flowing from that loss has to be assessed on the supposition of comparing her present entire lack of earning capacity with the earning capacity she would have had if she had not been injured, but all other events, including the death of her husband, had happened as they actually did happen.
12 The Trial Judge's assessment of Future Economic Loss was expressed as follows (Red 24-25):
… she was working on a part-time basis only. She was restricted in what she could earn due in part to her husband's disability so that her pre-accident capacity was exercised to a limited degree. Her background and work history show that she had a substantial earning capacity. I would award the sum of $200 per week net as a fair measure of her loss of earning capacity occasioned by virtue of the injuries she suffered. Assuming her working life to age 65 means a further 18 years at $200 per week net, less 15 per cent vicissitudes, which is calculated as 18 years at $200 per week net times multiplier 625 times 85 per cent equals $106,250 which are awarded for future economic loss.
13 The allowance of $200 per week is net of income tax, assuming gross earnings in the order of $225 per week. $200 per week is about twice the earnings of $100 per week Mrs Lang made by working about 7½ hours per week before her injury while caring for her husband. The Trial Judge found that earnings at this rate would continue until age 65. Senior Counsel for the appellant contended to the effect that the assessment of $200 per week was an error. It was said that the figure was plucked out of the air and was not supported by the evidence which showed that in the pre-accident phase her earnings averaged about $100 per week, as the Trial Judge found; and $100 was adopted for the assessment of economic loss up to the trial. It was contended that the Trial Judge acted in an arbitrary way in taking the pre-accident earnings of about $100 but then moving to $200 per week for the assessment for Future Economic Loss; it was contended that the arbitrary element in the assessment betrayed an error in method. Counsel pointed out, referring to Graham v. Baker (1961) 106 CLR 340 and to Malec v JC Hutton Pty Limited , that it was necessary (as indeed it is) to assess damages on the basis that the impairment of earning capacity sounds in damages only to the extent that there actually is an economic loss, meaning that Mrs Lang's earning capacity of $100 per week should actually have been used. It was also contended that in assessing damages for loss of future earning capacity a percentage discount related to the degree of probability of Mrs Lang's having engaged in employment should have been allowed, as in Malec v J C Hutton Pty Limited at 643.
14 I do not accept these contentions. It is necessary to adhere to the hypothesis that Mrs Lang herself was uninjured, although all other events happened as they actually did, including the death of her husband, and the end of her caring responsibilities and of her Carer's Allowance. Given her earlier history of part-time employment, even though she faced significant difficulties and alternative claims on her time and attention, I regard the facts as presenting a sound basis for the view that if not injured she would have found part-time employment of kinds she had had in the past, including school cleaning, work as a cook and a housemaid, child care or in some other way. Mrs Lang's previous work history shows that, in her hypothetical future working career, she would not have been limited to school cleaning employment, and the hypothesis that she would have found part-time employment of a similar nature totalling in the order of 15 hours per week is readily acceptable. She is a person of some enterprise, and the Trial Judge was not in a position simply to make no finding just because it is extremely difficult to make an accurate assessment. The Trial Judge's assessment of her earning capacity on the basis of her earning $200 a week, about twice her average part-time earnings while her husband was alive but approximately equal to the total of her part-time earnings and her Carer's Allowance at that time, is modest and realistic, and in no way excessive.
15 The Trial Judge in calculating damages for Future Economic Loss adopted a discount of 15 per cent for vicissitudes of life. His Honour did not make any other allowance related to the degree of probability of Mrs Lang's having engaged in employment: it should be understood that the Trial Judge regarded any element of contingency as sufficiently dealt with by the 15 per cent allowance. Senior Counsel for the appellant contended that this discount was inadequate and that the appropriate rate to adopt should be 25 per cent. Counsel contended that given the evidence in relation to Mrs Lang's intercurrent medical conditions, particularly her diabetes and the effect that that was going to have upon her as a real possibility in the future, the allowance for vicissitudes should be greater than that normally adopted. It was contended that the evidence showed and it should have been found that the effects of Mrs Lang's intercurrent medical conditions would be more or less insidious and likely to overtake her before she reached the usual retirement age.
16 In support of this contention counsel referred to the evidence of Dr Hammill who made the estimate that her life expectancy would be 70 at least. A passage in his evidence (Black 107) was referred to in support of the submission. For clarity I think I should begin a little earlier at Black 106:
Q. And she has been an insulin dependent diabetic then for fourteen years?
A. Yes.