Selected characteristics of groups of subjects with no cognitive impairment (NCI) and clinical diagnoses of mild cognitive impairment (MCI) and Alzheimer's disease (AD).

d<p>Significantly different from NCI and from MCI (<i>P</i><10⁻⁸ for both).</p>e<p>Significantly different from NCI (<i>P</i> = 0.040).</p>f<p>Significantly different from NCI (<i>P</i> = 2.6×10⁻⁷) and from MCI (<i>P</i> = 9.6×10⁻⁷).</p>g<p>Significantly different from MCI (<i>P</i> = 0.012) and from AD (<i>P</i> = 0.015).