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Table 4 Score ranges, percentiles, and distribution parameters for the traditional test scores and CFC scores

From: Assessing cognition and daily function in early dementia using the cognitive-functional composite: findings from the Catch-Cog study cohort

  Score range Percentiles Distribution
Original Current sample 5 10 25 50 75 90 95 Skewness Kurtosis
ADAS-Cog 0–80 6–47 14 16 19 26 30 35 40 .236 .217
ADCS-ADL 0–78 39–78 47 55 60 68 73 75 77 − .902 .477
CDR-SB 0–18 0–12 .5 .7 2.0 3.5 5.5 7.0 8.7 .596 .142
ADCOMS 0–1.47 .05–1.21 .10 .15 .28 .43 .61 .86 .99 .620 − .042
A-IADL-Q N.A. − 2.01–1.95 − 1.71 − 1.32 − .64 .00 .63 1.04 1.42 − .091 − .457
Cognitive Composite N.A. − 1.44–1.33 − 1.13 − .88 − .52 − 0.04 .40 .81 .96 − .046 − .445
CFC N.A. − 1.51–1.37 − 1.14 − .87 − .42 − 0.04 .38 .78 .88 − .136 − .440
  1. Abbreviations: ADAS-Cog Alzheimer’s Disease Assessment Scale–Cognitive subscale, ADCOMS Alzheimer’s Disease Composite Score, ADCS-ADL Alzheimer’s Disease Cooperation Study–Activity of Daily Living, CDR-SB Clinical Dementia Rating Sum of Boxes, CFC cognitive-functional composite