When assessing whether an omission from a medical history renders expert psychiatric opinion unreliable, the decision-maker must evaluate whether the omission is material in the context of all the evidence, not merely note the existence of the omission. A finding that physical injuries are permanent can support a finding that a consequential psychiatric condition is also permanent. Direct mathematical conversion of social security impairment ratings to percentage disability is impermissible; the conversion requires a judgment about the extent to which the psychiatric condition has reduced the worker's ability to do work of any kind, with 100 per cent reflecting total incapacity.
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