• Title, Summary, Keyword: KNHANES

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Change in the height of Korean children and adolescents: analysis from the Korea National Health and Nutrition Survey II and V

  • Ryoo, Na Yung;Shin, Ha Young;Kim, Jae Hyun;Moon, Jin Soo;Lee, Chong Guk
    • Clinical and Experimental Pediatrics
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    • v.58 no.9
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    • pp.336-340
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    • 2015
  • Purpose: The mean adult height of Koreans has increased since nationwide anthropological measurements began in 1967. The objective of this study was to evaluate differences in heights of Korean late adolescents and young adults within and between the Second and Fifth Korea National Health and Nutrition Examination Surveys (KNHANES II and V). Methods: Koreans aged ${\leq}22$ years with available measurements of height were enrolled from the KNHANES surveys (KNHANES II: n=3,372 [1,732 males and 1,640 females]; KNHANES V: n=6,190 [3,198 males and 2,992 females]). Differences in the height of KNHANES respondents within and between surveys were evaluated according to age and sex. Results: In KNHANES II, there was no significant difference in height between males aged 17-19 years and those aged 20-22 years ($174.3{\pm}0.5cm$ vs. $174.3{\pm}0.6cm$, P=0.995). Females aged 20-22 years were taller than those aged 17-19 years ($159.8{\pm}0.4cm$ vs. $161.0{\pm}0.4cm$, P=0.017). Females aged 17-19 years were significantly taller in KNHANES V than in KNHANES II ($161.2{\pm}0.3cm$ vs. $159.8{\pm}0.4cm$, P=0.004). Respondents aged 20-22 years were taller in KNHANES V than in KNHANES II, although not significantly so; the difference was $0.3{\pm}0.8cm$ in males (P=0.721) and $0.5{\pm}0.6cm$ in females (P=0.386). Conclusion: Koreans appear to continue growing even in their late adolescence and early twenties. Consequently, it may be necessary to expand the reference age ranges of the Korean growth chart. Additionally, a longitudinal growth survey is needed to determine growth patterns and secular trend in height among Koreans.

Calibration of High-Density Lipoprotein Cholesterol Values From the Korea National Health and Nutrition Examination Survey Data, 2008 to 2015

  • Yun, Yeo-Min;Song, Junghan;Ji, Misuk;Kim, Jeong-Ho;Kim, Yongkang;Park, Taesung;Song, Sang Hoon;Park, Seungman;Kim, Min Jin;Nho, Sun Jin;Oh, Kyung Won
    • Annals of Laboratory Medicine
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    • v.37 no.1
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    • pp.1-8
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    • 2017
  • Background: For correct interpretation of the high-density lipoprotein cholesterol (HDL-C) data from the Korea National Health and Nutrition Examination Survey (KNHANES), the values should be comparable to reference values. We aimed to suggest a way to calibrate KNHANES HDL-C data from 2008 to 2015 to the Centers for Disease Control and Prevention (CDC) reference method values. Methods: We derived three calibration equations based on comparisons between the HDL-C values of the KNHANES laboratory and the CDC reference method values in 2009, 2012, and 2015 using commutable frozen serum samples. The selection of calibration equation for correcting KNHANES HDL-C in each year was determined by the accuracy-based external quality assurance results of the KNHANES laboratory. Results: Significant positive biases of HDL-C values were observed in all years (2.85-9.40%). We created the following calibration equations: standard $HDL-C=0.872{\times}[original\;KNHANES\;HDL-C]+2.460$ for 2008, 2009, and 2010; standard $HDL-C=0.952{\times}[original\;KNHANES\;HDL-C]+1.096$ for 2012, 2013, and 2014; and standard $HDL-C=1.01{\times}[original\;KNHANES\;HDL-C]-3.172$ for 2011 and 2015. We calibrated the biases of KNHANES HDL-C data using the calibration equations. Conclusions: Since the KNHANES HDL-C values (2008-2015) showed substantial positive biases compared with the CDC reference method values, we suggested using calibration equations to correct KNHANES data from these years. Since the necessity for correcting the biases depends on the characteristics of research topics, each researcher should determine whether to calibrate KNHANES HDL-C data or not for each study.

Suicide Related Indicators and Trends in Korea in 2016 (2016 자살 관련 지표들과 추이)

  • Yang, Jieun;Ju, Yeong Jun;Park, Eun-Cheol;Jang, Sung-In
    • Health Policy and Management
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    • v.28 no.1
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    • pp.87-90
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    • 2018
  • Suicide has been a public health issue in many countries, and Korea has ranked highest suicide rate among Organization for Economic Cooperation and Development (OECD) countries over a decade. To address these issues, we updated the recent trends in suicidal ideation and suicide attempts among Korean adults followed by previous data observation. We used data from five sources: Korean National Health and Nutrition Examination (KNHANES, '07-12, '13, '15-16), Korean Community Health Survey (KCHS, '08-09, '13), Korean Wealth Panel Study (KOWEPS, '12-16), Korea Health Panel Survey (KHP, '10-13), and cause of death data from Statistics Korea ('07-16). We used weighted frequencies and trend tests. The rate of suicidal ideation as recent year was 5.10% (KNHANES, '15), 8.95% (KCHS, '13), 2.08% (KOWEPS, '16), and 5.39% (KHP, '13). That of suicide attempts as recent year was 0.59% (KNHANES, '16), 0.41% (KCHS, '13), and 0.08% (KOWEPS, '16). Annual percentage change of suicidal ideation was -2.80% (KNHANES, '07-12), 5.78% (KNHANES, '13-15), 0.62% (KCHS, '08-13), -8.50% (KOWEPS, '12-16), and -10.94% (KHP, '10-13). Annual percentage change of suicide attempts was -3.84% (KNHANES, '07-12), 2.26% (KNHANES, '13-16), -2.53% (KCHS, '08-13), and -20.22% (KOWEPS, '12-16). Annual percentage change of death by intentional self-harm was -0.49% (Statistics Korea, '07-16). Individuals who had lower income level were more likely to experience suicidal ideation and suicide attempts. According to these results, the rate of suicidal ideation and suicide attempts showed the decreasing tendency. However, the suicide rate of Korea has remained higher than that of OECD countries. Thus, continuous data observation and effective policies on suicide are needed.

Suicide Related Indicators and Trend of Korea in 2015 (2015 자살 관련 지표들과 추이)

  • Ju, Yeong Jun;Jang, Sung-In
    • Health Policy and Management
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    • v.27 no.1
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    • pp.75-79
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    • 2017
  • Suicide is becoming a public health issue in many countries, and even more so in Korea. Korea has the highest suicide rate in the Organization for Economic Cooperation and Development countries. To address these issues, we investigated the recent trends in suicidal ideation and suicide attempts among the adult population. We used data from four sources: Korean National Health and Nutrition Examination Survey (KNHANES, '2007-2012, '2013, '2015), Korean Community Health Survey (KCHS, '2008-2009, '2013), Korean Wealth Panel Study (KOWEPS, '2012-2015), and Korea Health Panel Survey (KHP, '2010-2013). Weighted frequencies and trend tests were used. The rate of suicidal ideation as recent year was 5.10% (KNHANES, '2015), 8.95% (KCHS, '2013), 2.34% (KOWEPS, '2015), or 5.39% (KHP, '2013). Regarding the suicide attempts, the rate of suicide attempts as recent year was 0.61% (KNHANES, '2015), 0.41% (KCHS, '2013), or 0.04% (KOWEPS, '2015). Average percent change of suicidal ideation during survey year was -2.80% (KNHANES, '2007-2012), 5.78% (KNHANES, '2013-2015), 0.62% (KCHS, '2008-2013), -5.63% (KOWEPS, '2012-2015), and -10.94% (KHP, '2010-2013). Average percent change of suicide attempts during survey year was -3.84% (KNHANES, '2007-2012), 4.55% (KNHANES, '2013-2015), -2.54% (KCHS, '2008-2013), and -18.96% (KOWEPS, '2012-2015). Those who had lower income level were more likely to have self-reported suicidal ideation and suicide attempts. Our results suggest that further efforts are needed for more effective intervention to identify and manage low income strata with suicide problem.

An Empirical Analysis of Effects of Depression on Suicidal Ideation of Korean Adults: Emphasis on 2008~2012 KNHANES Dataset (국내성인에 있어서 우울증이 자살생각에 미치는 영향에 관한 실증연구: 국민건강영양조사 2008~2012 자료를 중심으로)

  • Jeon, Hyeon Gyu;Sim, Jae Mun;Lee, Kun Chang
    • The Journal of the Korea Contents Association
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    • v.15 no.7
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    • pp.264-281
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    • 2015
  • Suicidal ideation has received much attention from both practitioners and researchers as Korean society becomes aging and individualistic. However, previous researches on the suicide ideation have focused on young generations instead of adults who seem to be more suffered from economic pressure and all kinds of exterior environments causing depression. Besides, there were research voids in the suicidal ideation area where depression was never taken into consideration. In this sense, we attempted to launch empirical studies on analyzing explanatory factors relevant to suicidal ideation in all the age groups by using KNHANES dataset from 2008~2012 years. Especially, we further analyzed KNHANES dataset to know how much depression affects suicidal ideation. Empirical results showed that depression is in a significant relationship with the suicidal ideation in all the demographic dimensions such as age, education, living area, etc.

Periodontal health status of adolescents aged 15 years in Jinju city (진주시 15세 청소년의 치주건강 상태)

  • Kim, Se-Yeon;Han, Sang-Jun;Lee, Jung-Ha;Kim, Ji-Soo;Kim, Han-Na;Lee, Ju-Youn;Kim, Jin-Bom
    • Journal of Korean Academy of Oral Health
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    • v.42 no.3
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    • pp.84-89
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    • 2018
  • Objectives: The purpose of this study was to evaluate the periodontal status of adolescents aged 15 years in Jinju city. Methods: The study subjects were 506 adolescents aged 15 years in Jinju city. We investigated the prevalence and severity of periodontal disease using the Community Periodontal Index (CPI) recommended by the WHO. Data on the frequency of daily tooth-brushing were collected through self-reported questionnaires. The information obtained on both the periodontal health status and frequency of daily toothbrushing of adolescents in Jinju city was compared with the data from the 6th Korea National Health and Nutrition Examination Survey 2013-2015 (KNHANES-VI). The software utilized in the analysis was SPSS version 23. Statistical significance was set at P<0.05. Results: The rate of healthy periodontal status in Jinju city was lower compared to KNHANES-VI (57.7% versus 63.7%). The rate of gingival bleeding in Jinju city and KNHANES-VI was 11.3% and 10.8%, respectively. The rate of calculus in Jinju city and KNHANES-VI was 31.0% and 25.6%, respectively. The rates of gingival bleeding and calculus were not significantly different between Jinju city and KNHANES-VI. The healthy periodontal segments in Jinju city were more than those in KNHANES-VI (5.43 versus 5.25). The bleeding periodontal segments in Jinju city were less than those in KNHANES-VI (0.25 versus 0.45). However, the periodontal segments with calculus in Jinju city were not significantly different from those of KNHANES-VI (0.31 versus 0.30). The frequency of daily tooth-brushing in Jinju city was more than that in KNHANES-VI (2.67 versus 2.47). Conclusions: These findings suggest that appropriate oral health education should be widely conducted to promote periodontal health in adolescents.

Comparison of Physical Activity Questions in the Korea National Health and Nutrition Examination Surveys (국민건강영양조사 신체활동 설문 문항 비교)

  • Kim, Wan-Soo
    • Korean Journal of Health Education and Promotion
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    • v.29 no.3
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    • pp.23-34
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    • 2012
  • Objectives: This study aims to compare the contents of physical activity questions of Korean National Health and Nutrition Examination Survey(KNHANES), and to propose suggestions for improvement. Methods: Questions measuring physical activity prevalence of adults in the KNHANES from KNHANES I(1998) to the first year of KNHANES V(2010) were compared. Results: The questions used in each survey showed some problems in consistency and appropriateness. Major issues identified are as follows. First, the questions in each survey were not consistent, and would be inappropriate to make time series comparisons. Second, the purpose of physical activity was not clear. Third, the examples of physical activities suggested in the questions were not appropriate. Fourth, the intensity of physical activity were not adequately described. Fifth, by excluding walking from the moderate-intensity physical activity category, the prevalence of moderate-intensity physical activity could be underestimated. Sixth, it is difficult to measure the total amount of physical activity performed in one day because answers from the other domains cannot be clearly differentiated. Conclusions: The physical activity questions in the KNHANES questionnaire should be improved so that they are consistent with the purpose of survey, the respondents can easily understand the contents of the questions, and the questions can measure all physical activity performed in the different domains.

Inappropriate Survey Design Analysis of the Korean National Health and Nutrition Examination Survey May Produce Biased Results

  • Kim, Yangho;Park, Sunmin;Kim, Nam-Soo;Lee, Byung-Kook
    • Journal of Preventive Medicine and Public Health
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    • v.46 no.2
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    • pp.96-104
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    • 2013
  • Objectives: The inherent nature of the Korean National Health and Nutrition Examination Survey (KNHANES) design requires special analysis by incorporating sample weights, stratification, and clustering not used in ordinary statistical procedures. Methods: This study investigated the proportion of research papers that have used an appropriate statistical methodology out of the research papers analyzing the KNHANES cited in the PubMed online system from 2007 to 2012. We also compared differences in mean and regression estimates between the ordinary statistical data analyses without sampling weight and design-based data analyses using the KNHANES 2008 to 2010. Results: Of the 247 research articles cited in PubMed, only 19.8% of all articles used survey design analysis, compared with 80.2% of articles that used ordinary statistical analysis, treating KNHANES data as if it were collected using a simple random sampling method. Means and standard errors differed between the ordinary statistical data analyses and design-based analyses, and the standard errors in the design-based analyses tended to be larger than those in the ordinary statistical data analyses. Conclusions: Ignoring complex survey design can result in biased estimates and overstated significance levels. Sample weights, stratification, and clustering of the design must be incorporated into analyses to ensure the development of appropriate estimates and standard errors of these estimates.

Suicide Related Indicators and Trends in Korea in 2017 (2017년 자살 관련 지표들과 추이)

  • Kwon, Junhyun;Yang, Jieun;Ju, Yeong Jun;Park, Eun-Cheol;Jang, Sung-In
    • Health Policy and Management
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    • v.29 no.1
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    • pp.77-81
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    • 2019
  • Suicide is a major public health issue that causes over 800,000 deaths each year globally. Korea ranks high in suicide rates, in which around 24.3 per 100,000 individuals are reported to have died by intentional self-harm in 2017 according to Statistics Korea. The aim of this study was to examine the current status and trend of suicide ideation and attempt using data from the following five sources: Korean National Health and Nutrition Examination (KNHANES, '07-13, '15-17), Korean Community Health Survey (KCHS, '08-09, '13, '17), Korean Wealth Panel Study (KOWEPS, '12-17), Korea Health Panel Survey (KHP, '10-13), and Statistics Korea (1983-2017). Suicide ideation and attempts were also further examined based on equalized household income levels. Data published by Statistics Korea were used to show the updated suicide rate and number of deaths by intentional self-harm. The rate of suicide ideation at the recent year was 4.73% (KNHANES, '17), 6.96% (KCHS, '17), 1.63% (KOWEPS, '17), and 5.39% (KHP, '13). That of suicide attempts as recent year was 0.71% (KNHANES, '17), 0.32% (KCHS, '17), and 0.09% (KOWEPS, '17). Annual percentage change of suicidal ideation was -15.4% (KNHANES, '07-17), -2.5% (KCHS, '08-17), -8.6% (KOWEPS, '12-17), and -10.9% (KHP, '10-13). Annual percentage change of suicide attempts was -4.0% (KNHANES, '07-17), -4.4% (KCHS, '08-17), and -14.9% (KOWEPS, '12-17). Individuals with lower income levels were more likely to experience suicide ideation and attempts. Considering that Korea still shows a high suicide rate despite the continuously decreasing trend of suicide ideation and attempt, continuous observation and appropriate policy implementation regarding suicide related problems are necessary.

Data Cleaning and Integration of Multi-year Dietary Survey in the Korea National Health and Nutrition Examination Survey (KNHANES) using Database Normalization Theory (데이터베이스 정규화 이론을 이용한 국민건강영양조사 중 다년도 식이조사 자료 정제 및 통합)

  • Kwon, Namji;Suh, Jihye;Lee, Hunjoo
    • Journal of Environmental Health Sciences
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    • v.43 no.4
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    • pp.298-306
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    • 2017
  • Objectives: Since 1998, the Korea National Health and Nutrition Examination Survey (KNHANES) has been conducted in order to investigate the health and nutritional status of Koreans. The food intake data of individuals in the KNHANES has also been utilized as source dataset for risk assessment of chemicals via food. To improve the reliability of intake estimation and prevent missing data for less-responded foods, the structure of integrated long-standing datasets is significant. However, it is difficult to merge multi-year survey datasets due to ineffective cleaning processes for handling extensive numbers of codes for each food item along with changes in dietary habits over time. Therefore, this study aims at 1) cleaning the process of abnormal data 2) generation of integrated long-standing raw data, and 3) contributing to the production of consistent dietary exposure factors. Methods: Codebooks, the guideline book, and raw intake data from KNHANES V and VI were used for analysis. The violation of the primary key constraint and the $1^{st}-3rd$ normal form in relational database theory were tested for the codebook and the structure of the raw data, respectively. Afterwards, the cleaning process was executed for the raw data by using these integrated codes. Results: Duplication of key records and abnormality in table structures were observed. However, after adjusting according to the suggested method above, the codes were corrected and integrated codes were newly created. Finally, we were able to clean the raw data provided by respondents to the KNHANES survey. Conclusion: The results of this study will contribute to the integration of the multi-year datasets and help improve the data production system by clarifying, testing, and verifying the primary key, integrity of the code, and primitive data structure according to the database normalization theory in the national health data.