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ROC analysis of walking speed in the ≥1.0 m/s group. The cutoff value for step length-to-height ratio identified by ROC analysis was determined to be 31.0%, with a sensitivity of 95.8%, 1-specificity of 85.9%, and area under the curve value of 0.96 (95% CI: 0.94–0.99, p < 0.01).
