Table 4. Receiver operating characteristic analysis for the evaluation of the discrimination ability of serum 25-hydroxyvitamin D concentrations of (i) mild cognitive impairment from Alzheimer’s disease and (ii) mild cognitive impairment progressed or not to Alzheimer’s disease.

MCI: individuals with mild cognitive impairment, AD: individuals with Alzheimer’s disease, AUC: area under the curve, CI: confidence interval, PPV: positive predictive value, NPV: negative predictive value, OR: odds ratio.