ABSTRACT
Objective: To compare the Clock Drawing Test (CDT), and the Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) and the Mini Mental State Examination (MMSE) in dementia patients. Methods: The prospective study was carried out in Srithanya hospital from April 2005 to July 2006. There were 106 patients interviewed by one psychiatric nurse. CDT developed by Royall et al (CLOX1) was selected in this study. The Thai version of MMSE was MMSE-Thai 2002. IQCODE was a 1-5 rating scale on 16 items. Pearson’s correlation and cut- off point were analyzed. Results: The age range was 53-85 years and the average age was 67.43 ± 8.2 years. Females were 60.4%. Most had a primary level of education (38.6%). There were 27 demented, 11 physical illness, 8 depression and Parkinson and 60 normal elderly cases. Means of MMSE, CLOX1 and IQCODE were 24.70 ± 4.85, 9.59 ± 4.01, 3.34 ± 0.44 respectively. Both questionnaires were significantly correlated with MMSE. The optimal cut-off point (sensitivity, specificity) of CLOX1 and IQCODE for dementia were < 8 ( 79.7, 85.2%) and ≥ 3.25 (83.5, 81.5%) respectively. Conclusion: These instruments could be used for screening cognitive impairment in clinical practice. Each tool had a different superior aspect regarding context.