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Table 4 Mean values and predictive ability of the frailty indices constructed with and without dichotomization of health deficits included in each frailty index

From: Comparison of alternate scoring of variables on the performance of the frailty index

  

Mean FI score* (SD)

  

ROC area (CI)

 

Survey

Male FIordinal

Male FIdichotomous

Female FIordinal

Female FIdichotomous

Male FIordinal

Male FIdichotomous

Female FIordinal

Female FIdichotomous

NSHS

0.10 (0.08)

0.11 (0.08)

0.12 (0.10)

0.13 (0.11)

0.76 (0.73,0.80)

0.76 (0.73,0.79)

0.80 (0.77,0.84)

0.80 (0.77,0.83)

SHARE

0.16 (0.12)

0.13 (0.12)

0.19 (0.13)

0.17 (0.14)

0.77 (0.75,0.78)

0.77 (0.75,0.78)

0.78 (0.76,0.80)

0.78 (0.76,0.80)

Yale-PEP

0.23 (0.10)

0.21 (0.12)

0.26 (0.11)

0.25 (0.14)

0.70 (0.63,0.77)

0.69 (0.62,0.76)

0.68 (0.63,0.73)

0.66 (0.61,0.71)

  1. *Significant differences between ordinal and dichotomous FIs for both males and females (p < 0.05).
  2. SD = Standard Deviation, CI = Confidence Intervals, FI = frailty index.
  3. SHARE = Survey of Health, Ageing and Retirement in Europe.
  4. NSHS = Nova Scotia Health Survey.
  5. Yale-PEP = Yale Precipitating Events Project.