Introduction: Frailty is a common geriatric syndrome including the reduction in functional status which necessitates the provision of support in the performance of basic daily activities. Frailty, highly prevalent in old age, is caused by diminished muscle mass and muscle strength characterised by unintended body mass loss, decreased physical activity, slowed walking speed, exhaustion and weakness. The Frail Non-Disabled questionnaire – FiND is one of the instruments used in frail non-disabled individuals for timely recognition of frailty. Purpose: The purpose of the master thesis was to translate the FiND questionnaire and modify it to accord the Slovene linguistic properties and culture and verify its internal consistency, reliability, validity, sensitivity and specificity in the sample of older adults living independently in their home environment. Methods: The screening FiND questionnaire was translated from English into Slovene and back-translated observing the protocol recommended by Beaton and colleagues (2000). The inner consistency was tested with the Cronbach coefficient α and its reliability with the repeated measurement with the intraclass correlation coefficient. The correlation between the FiND-S questionnaire and the frailty index was additionally tested with the Spearman's correlation coefficient. In the final stage, the sensibility and specificity of the questionnaire were tested with the ROC analysis. Results: The research sample consisted of 30 older adults. Using the FiND-S questionnaire, it was established that 25 of the participants were robust and five of them were frail. According to the frailty phenotype and the frailty index, 24 participants were robust and the remaining 6 were frail. The inner consistency of the questionnaire was acceptable since the Cronbach coefficient amounted to 0.831 (the lowest confidence level = 0.781, i.e. 95 %). In the first and second testing, the median for the FiND-S questionnaire was 0.0 (confidence interval = 0.0-0.0; 95 %), but the difference was not statistically significant. The obtained interclass correlation coefficient was 0.868 (0.720-0.937), which means that the questionnaire has a high reliability. The correlation between the FiND-S questionnaire and the frailty index was high ( = 0.873 (0.749 – 0.938)) and statistically significant (p < 0.0001), which confirms the validity of the FiND-S questionnaire. In ROC analysis, the area under the curve was over 0.9 and is statistically significant. Given that an individual's score in the FiND-S questionnaire is above the threshold t=0, the sensitivity was 83.3% and the specificity 100%. Discussion and conclusion: Results of the pilot study indicate that the translation of the FiND-S questionnaire is satisfactory and suitable for use in the Slovene linguistic and cultural environment. The questionnaire enables self-assessment and recognition of frailty symptoms. The physiotherapist may find the questionnaire of great advantage in everyday practice on the primary level of healthcare.
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