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Mean annualized Medicare costs according to baseline frailty category and 1-year CFI change. Baseline frailty category was defined as nonfrail (CFI<0.25), mildly frail (CFI 0.25–0.34), and moderately-to-severely frail (CFI≥0.35). The 1-year change in CFI (CFI2016 − CFI2015) was categorized as large decrease (−<0.045), small decrease (−≤0.045–0.015), stable (±0.015), small increase (>0.015–0.045), or large increase (>0.045). SNF = skilled nursing facility.
