Final answer:
The test result that is most likely to be predictive of an injurious fall is gait speed of 0.7 meters per second.
Step-by-step explanation:
The test result that is most likely to be predictive of an injurious fall is gait speed of 0.7 meters per second. Gait speed is a measure of how quickly a person walks, and a slower gait speed is associated with an increased risk of falls and fall-related injuries. In Mrs. Smith's case, her history of falls and the concern for future injurious falls make evaluating her gait speed an important factor. A gait speed of 0.7 meters per second indicates slower walking speed, which could be indicative of underlying balance and mobility issues.