Where an employer's breach of duty exacerbates a psychiatric condition caused by a non-tortious event (here, a shooting incident), but the medical evidence establishes only that early intervention could have reduced the severity and duration of the condition without establishing that the breach materially contributed to the condition developing at all, damages must be assessed on a loss of chance basis rather than as full compensation for the condition. The distinction between causing a condition and exacerbating it is critical to the measure of damages. Medical evidence using terms like 'contributed' and 'exacerbated' without specifying the degree of contribution may be insufficient to establish material contribution.
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