Published online 2014 Jan 31. doi: 10.4258/hir.2014.20.1.30

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PMID: 24627816

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Abstract

Objectives

The purpose of this study was to design a prediction model that explains the characteristics of elderly adults at risk of malnutrition.

Methods

Total war for mac torrent. Data were obtained from a large data set, 2008 Korean Elderly Survey, in which the data of 15,146 subjects were entered. With nutritional status a target variable, the input variables included the demographic and socioeconomic status of participants. The data were analyzed by using the SPSS Clementine 12.0 program's feature selection node to select meaningful variables.

Results

Among the C5.0, C&R Tree, QUEST, and CHAID models, the highest predictability was reported by C&R Tree with the accuracy rate of 77.1%. The presence of more than two comorbidities, living alone status, having severe difficulty in daily activities, and lower perceived economic status were identified as risk factors of malnutrition in elderly.

Conclusions

A reliable decision support model was designed to provide accurate information regarding the characteristics of elderly individuals with malnutrition. The findings demonstrated the good feasibility of data mining when used for a large community data set and its value in assisting health professionals and local decision makers to come up with effective strategies for achieving public health goals.

Keywords: Decision Trees, Data Mining, Malnutrition, Aged, Community

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I. Introduction

Data mining is a recently developed technological methodology that has been used intensively and extensively in many fields. It is defined as the process of discovering previously unknown patterns or trends from stored data, building predictive models based on that information. Compared with the past healthcare system, there has been an ever increasing amount of data generated by current healthcare settings. The amount of data generated in current healthcare settings is becoming too large and complex to be analyzed by traditional statistical methods. Due to its good applicability to any field of study, data mining has gradually gained popularity in almost all areas of healthcare [1]. However, data mining has been used mostly to analyze disease-focused clinical data rather than community data gathered for primary care providers in Korea. The importance of accessing community health status has been widely recognized throughout the nation and data mining can empower local decision makers with a clear methodology for organizing and interpreting healthcare data [].

Data mining has been recognized as a solution to handle these large amounts of complex data, transforming these data into meaningful information for the decision making process of health professionals. A comprehensive community health profile plays an important role in the development, refining and monitoring of long-term strategies designed to improve the overall health status of the population across the nation. Such information obtained at the community level can be used to ensure that the best resource allocation choices are made to improve community health [3]. Along with Korean Elderly Survey, a number of national representative studies, such as the Korean Longitudinal Study of Ageing and the Korean Retirement and Income Study, have recently been conducted in Korea [,5]. Currently, more healthcare data are available at the community level, enabling health professionals to make a transition from the previous disease- and treatment-focused strategy to a health- and prevention-focused strategy. This also clarifies the public health role, which should be supported by unbiased data that accurately reflect a community's health status, needs, and resource allocation [6].

The proportion of elderly population in Korea reached 11.8% in 2012 which is expected to increase further accounting for 24.3% in 2030 and 37.4% by 2050 [7]. The growing elderly population has a huge impact on the healthcare system, and malnutrition is a common health problems found frequently among the elderly [8]. The leading causes of malnutrition include several individual factors, such as poor oral health, loss of vision and hearing, dementia, impaired mobility, and pain. Malnutrition is both a cause and consequence of many geriatric diseases that accounts for a significant proportion of national medical spending []. Nutritional status has a great influence on the immune system of the human body; the lower immune response induced by malnutrition eventually puts elderly individuals at a high risk of infection, increasing the risk of mortality [10]. A rapid and precise diagnostic method that supports clinical decision enables the earlier identification of the elderly at risk of malnutrition. This will eventually prevent negative outcomes caused by poor nutritional status, resulting in a substantial reduction in healthcare cost spent on the elderly population []. Most studies to date have conducted research on small samples obtained from local hospitals or specific communities using traditional statistical analysis, which may not be sufficient for discovering comprehensive knowledge []. In addition, the limited number of variables analyzed in those studies could not provide integrative understanding of elderly malnutrition.

Data mining is known to be the best method in terms of the cost estimation, disease diagnosis, prediction of prognosis, and the discovery of hidden patterns in the healthcare system with the use of large health database [13]. A decision tree model presented in this study was developed from a combination of decision tree approaches and statistical analysis. Data mining provides information that can be the used in the analysis of risk factors for certain types of diseases. Contrasting the characteristics of ill patients with those of healthy people to find the patterns related to the occurrence of disease has been a common practice in evidence-based medicine []. The purposes of the study were to identify the best modeling method among data mining tools by testing the discriminatory power of individual models and to identify the patterns related to the occurrence of malnutrition in elderly. Finding patterns for the related characteristics of risky conditions that threaten the health of the community may contribute to the achievement of public health goals with effective disease prevention strategies. By identifying the associated characteristics of older adults who are more likely to be malnourished in community settings, the decision tree model allows health professionals and decision makers to intervene earlier to allocate adequate resource for nutritional support, improving the overall health of the community.

II. Methods

1. Subjects

A secondary analysis of a large community data set from the 2008 national study of Korean elderly was conducted to provide accurate information regarding the characteristics of the elderly at risk of malnutrition in Korea. The Institutional Review Board gave prior approval to the study. The sample consisted of 15,146 adults over 60 years old and community dwelling. The ten items of the 'Determine Your Nutritional Health Checklist' were used to access dietary intake and meal patterns. The tool was developed by the Nutritional Screening Initiative to screen nutritional risk in the elderly population. A summed score of 0-2 indicates good nutritional status, 3-5 moderate risks, and 6 or more high risk []. In this study, elderly people with summed scores of 3 or more were classified as being at risk of malnutrition as they pose problems for malnutrition.

2. Decisio