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Table 3 The improvement in functional disability risk discrimination when adding each physical function measure as continuous variables to the basic model

From: Potential utility of physical function measures to improve the risk prediction of functional disability in community-dwelling older Japanese adults: a prospective study

  C-statistic Category-free NRI Absolute IDI
Basic model 0.770 (0.751 to 0.794) Reference Reference
Basic model + maximum gait speed 0.778 (0.759 to 0.803)* 0.267 (0.173 to 0.368)* 0.015 (0.007 to 0.024)*
Basic model + one-leg standing time 0.782 (0.760 to 0.805)* 0.405 (0.293 to 0.516)* 0.022 (0.017 to 0.028)*
Basic model + handgrip strength 0.775 (0.756 to 0.800)* 0.129 (0.013 to 0.242)* 0.009 (0.004 to 0.015)*
Basic model + maximum gait speed + one-leg standing time 0.785 (0.764 to 0.809)* 0.448 (0.336 to 0.551)* 0.031 (0.023 to 0.041)*
Basic model + maximum gait speed + handgrip strength 0.781 (0.761 to 0.805)* 0.308 (0.196 to 0.427)* 0.019 (0.010 to 0.029)*
Basic model + one-leg standing time + handgrip strength 0.784 (0.763 to 0.807)* 0.378 (0.272 to 0.517)* 0.027 (0.021 to 0.035)*
Basic model + all three physical function measures 0.787 (0.765 to 0.810)* 0.429 (0.322 to 0.554)* 0.034 (0.025 to 0.045)*
  1. Note: Basic model: sex, age, living alone, body mass index, multimorbidity, fall experience in the past year, cognitive impairment, smoking, drinking, and moderate-to-vigorous physical activity
  2. *p < 0.05 for difference with the basic model
  3. NRI net reclassification improvement; IDI integrated discrimination improvement