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Sir, Kim et al.1 examined the usefulness of the Clinical Dementia Rating (CDR) for predicting Alzheimer’s disease (AD) dementia progression in 59 elderly subjects with mild cognitive impairment (MCI). By logistic regression analysis, odds ratio [95% confidence interval (CI)] of CDR Orientation subscale for AD dementia progression was 12.3 (3.5–43.8). The authors recommended CDR Orientation subscale score for predicting AD dementia progression in elderly subjects with MCI. I have some concerns about their study. First, Xue et al.2 investigated risk factors for progression to AD and death in 437 elderly subjects with MCI. They adopted Cox model and adjusted hazard ratios (95% CIs) of female, older age, reading occasionally, current smoking, light-moderate alcohol drinking, cerebrovascular disease, hyperlipidemia and diabetes for transition from MCI to AD were 1.82 (1.20– 2.77), 3.09 (1.81–5.25), 1.79 (1.11–2.89), 1.74 (1.15–2.65), 2.24 (1.42–3.53), 2.70 (1.68–4.34), 1.87 (1.16–3.02), and 1.81 (1.18– 2.77), respectively. These significant factors should be considered as contributors of AD dementia progression in elderly subjects with MCI. Print ISSN 1738-3684 / On-line ISSN 1976-3026 OPEN ACCESS

psychiatry investigation

Comment on “Clinical Dementia Rating Orientation Score as an Excellent Predictor of the Progression to Alzheimer&apos;s Disease in Mild Cognitive Impairment”