Rapid population aging calls for new instruments and studies that will investigate factors of successful aging. Currently, in Slovenia, there are no instruments intended for monitoring cognitive decline and everyday competence in the elderly. Therefore, the purpose of the present study was to adapt and validate the questionnaires, which measure the above-mentioned concepts. Two questionnaires were adapted to Slovenian language and validated. The Informant Questionnaire on Cognitive Decline in the Ederly (IQCODE; Jorm, Scott and Jacomb, 1989) and Everyday Competence Questionnaire (ECQ; Kalisch et al., 2011) were distributed to the sample of 200 Slovenian elderly people living at home or in nursing homes. Confirmatory factor analysis showed that IQCODE measures a broad and general factor of cognitive decline. IQCODE had high internal consistency and proved to be a good screening tool for dementia. All items had sufficient discrimination indexes. ECQ's four-factor structure was not confirmed; instead I proposed a three-factor solution. ECQ also had high internal consistency, despite some of its shortcomings. In the future, exclusion of some of the ECQ's items and its mode of distribution/use should be considered. As expected, the questionnaires highly negatively correlated (ρ = –0,77), which speaks in favour of their validity. IQCODE was not correlated with the level of education, while ECQ was. Both questionnaires were correlated with living in nursing homes, age and work activity. ECQ should be further validated on elderly people with different levels of activity (physical and cognitive). Also, a shorter version of the IQCODE should be considered. With a few modifications, both questionnaires could be used for clinical and research purposes.
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