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. Author manuscript; available in PMC: 2010 May 1.
Published in final edited form as: Neurobiol Aging. 2008 Aug 13;31(5):732–740. doi: 10.1016/j.neurobiolaging.2008.06.014

Table 2.

Estimated total percentages of disagreement between dementia and non-dementia

Cut-off at percentile 10 20 30 40 50 60 70 80 90
Total % of Disagreement 0 2 2 6 6 8 6 2 0
97.5% Upper limit of disagreement (%) 3.62 5.45 5.45 12.60 12.60 15.16 12.60 5.45 3.62

The numbers show the proportion of disagreement of subjects being categorized into different statuses (AD and non-AD) based on the ranks of the two DF scores when the cut-off point is chosen as the 10th to the 90th percentiles. The estimated 97.5% upper limit of disagreement was to estimate the percentage of subjects categorized into different status (AD and non-AD) based on the ranks of the two DF scores at each percentile. The categorized statuses of subjects based on the ranks of two DF scores are similar when the cut-off points at both ends the distribution. Thus, it was less than 4% if the cut-off point is at the 10th and 90th percentiles and less than 6% at the 20th and 80th percentiles.