• Journal of the Korea Safety Management & Science
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• v.12 no.2
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• pp.217-223
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• 2010

The research proposes the complementary methodology using integrated hypothesis testing and confidence interval models that can be identified the statistical difference and practical equivalence. The models developed in this study can be used in the quality improvement processes such as QC story 15 steps. For the expressions of CI4LSD(Confidence Interval for Least Significant Difference) and CI4TOST(Confidence Interval for Two One-Sided Tests) are simple, quality practioners can efficiently handle them. CI4TOST models as a complement can be applied when CI4LSD models are influenced by sample size and precision.

• Journal of the Chungcheong Mathematical Society
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• v.14 no.2
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• pp.47-54
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• 2001

Let {Xn, n = 1,2,${\cdots}$} be i.i.d. random variables with the only unknown parameters mean ${\mu}$ and variance a ${\sigma}^2$. We consider a sequential confidence interval C1 for the mean with coverage probability 1-${\alpha}$ and expected length of confidence interval $E_{\theta}$(Length of CI)/${\mid}{\mu}{\mid}{\leq}k$ (k : constant) and give some asymptotic properties of the stopping time in various limiting situations.

• Journal of Korea Multimedia Society
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• v.17 no.2
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• pp.200-207
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• 2014

Blood pressure (BP) is an important vital signal for determining the health of an individual subject. Although estimation of mean arterial blood pressure is possible using oscillometric blood pressure techniques, there are no established techniques in the literature for obtaining confidence interval (CI) for systolic blood pressure (SBP) and diastolic blood pressure (DBP) estimates obtained from such BP measurements. This paper proposes a nonparametric bootstrap technique to obtain CI with a small number of the BP measurements. The proposed algorithm uses pseudo measurements employing nonparametric bootstrap technique to derive the pseudo maximum amplitudes (PMA) and the pseudo envelopes (PE). The SBP and DBP are then derived using the new relationships between PMA and PE and the CIs for such estimates. Application of the proposed method on an experimental dataset of 85 patients with five sets of measurements for each patient has yielded a smaller Cl than the conventional student t-method.

• Journal of Digital Convergence
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• v.16 no.10
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• pp.343-350
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• 2018

The purpose of this study was to identify the effect of nutrition related factors on mortality risk among community-residing older adults in Korea. We analyzed data from 8,532 older adults who took part in the 2008 living profiles of older people survey and 2011 death mortality data. According to Cox regression analysis, male (Hazard Ratio [HR], 2.03; 95% Confidence Interval [CI], 1.74~2.37), diabetes mellitus (HR, 1.35; 95% CI, 1.12~1.64), underweighted (HR, 2.68; 95% CI, 2.16~3.31), dysphagia (HR, 1.23; 95% CI, 1.02~1.47), chewing ability (HR, 1.33; 95% CI, 1.11~1.59), and undernutrition (HR, 1.47; 95% CI, 1.23~1.75) significantly affected mortality risk. Systematic nutrition support programs should be developed to decrease the mortality among Korean older adults.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.10
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• pp.7043-7052
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• 2015

This study divides subjects into people with metabolically healthy obesity and those with metabolically unhealthy obesity to identify the physical activities and nutrients influencing adults with obesity. Participants in the sixth Korea National Health and Nutrition Examination Survey conducted from January through December 2013 were selected as the subjects, and an analysis of complex survey samples was conducted with them. It was found that the number of days of a flexibility exercise (Odds ratio (OR)=1.18, 95% confidence interval (95% CI)=1.01-1.38), water intake (OR=1.04, 95% CI=1.01-1.06) and protein intake (OR=1.07, 95% CI=1.02-1.13) for one week were higher in people with metabolically healthy obesity than in those with metabolically unhealthy obesity, while their fat intake (OR=0.99, 95% CI=0.98-1.00)and carbohydrate intake (OR=0.98, 95% CI=0.97-0.99) were lower. Based on the results of this study, it was found that nursing intervention for obesity would need an approach according to the metabolic condition of obesity.

• The Journal of the Korea Contents Association
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• v.15 no.8
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• pp.336-344
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• 2015

This study evaluated the association between metabolic syndrome(MetS), its components and depression among Korean community-dwelling older adults. We analyzed data from the fifth Korea National Health and Nutrition Examination Survey(KNHANES-V) 2010-2012. This study was a descriptive study of 3,755 Korean elderly, aged 65 years and older. A modified version of the criteria of the National Cholesterol Education Program, Adult Treatment Panel III was used to define MetS. Depressive symptoms were assessed using the questionnaire of the KNHANES-V. Multiple regression analyses performed the association between MetS, its components and depression. MetS was not statistically associated depressive symptoms, but low high-density lipoprotein cholesterol(HDL-C) was statistically associated depressive symptoms(Odds raio[OR]=1.26, 95%Confidence Interval [CI]=1.002-1.584) in older adults. Among elderly women, MetS(OR=1.36, 95%CI=1.029-1.792), elevated fasting glucose(OR=1.41, 95%CI=1.070-1.851), low HDL-C(OR=1.21, 95%CI=1.078-1.746) were statistically associated depressive symptoms. In conclusion, present study showed an association between MetS and depressive symptoms in Korean community dwelling elderly women but not in men.

• Journal of muscle and joint health
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• v.25 no.2
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• pp.157-166
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• 2018

Purpose: This study aimed to identify the effect of the level of alcohol drinking and smoking period on the occurrence of lumbar and femoral neck osteoporosis in men aged 50 years and over. Methods: This study analyzed the data of 1,410 men based on results of a National Survey on Nutritional Health for the period 2010-2012. Complex sample multi-variate logistic regression analysis was conducted to determine whether alcohol drinking and smoking period were associated with osteoporosis in men aged 50 years older. Results: The risk of osteoporosis in the femoral neck was 3.43 times (95% confidence interval [CI]=1.15~10.29) higher in men who consumed less alcohol and smoked for a long time compared to men who smoked more than 40 years and consumed much alcohol at once. The risk of osteoporosis in the lumbar spine was 3.45 times (95% confidence interval [CI]=1.69~7.04) higher respectively. Men who consumed much alcohol at a time and smoked less than 40 years were 1.54 (1/0.65) times (95% confidence interval [CI]=0.45~0.93) more likely to be classified as normal than the men who consumed much alcohol and had a long smoking period. Conclusion: The interaction of excessive drinking and smoking has a more detrimental effect on bone mineral density.

• Journal of Industrial Convergence
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• v.18 no.6
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• pp.75-83
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• 2020

This study was a descriptive exploratory study to provide a foundation for improving the healthy working environment in Korean Red Cross Blood Center workers. A total of 215 surveys were collected from September 8 to October 31, 2020. Chi-squared test or Fisher's extract test, Independent t-tests, and Multiple Logistic Regression were performed with the SPSS 19.0 statistical program. We conducted multiple logistic regression analysis to evaluate the relationship between positive psychology capital and job stress with the perceived health status. The good perceived health status was 35.3%(N=76). When adjusted for related factors, the general characteristics and work characteristics were not related to perceived health status, and the positive psychological capital and job stress were significantly different between healthy and unhealthy groups (p<.001, p<.001). As positive psychology capital increased by one unit, the odds ratio of good health groups for subjective health increased significantly 1.1 times [95% Confidence interval (CI: 1.0-1.1)] and the odds ratio for good health groups for subjective health status decreased by 0.9 times [95% Confidence interval (CI: 0.8-0.9] as job stress increased by one unit.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.25 no.4
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• pp.191-199
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• 2013

It is estimated and analyzed that the design wave height and the confidence interval (hereafter CI) according to the return period using the fourteen-year wave data obtained at Pusan New Port. The functions used in the extreme value analysis are the Gumbel function, the Weibull function, and the Kernel function. The CI of the estimated wave heights was predicted using one of the Monte-Carlo simulation methods, the Bootstrap method. The analysis results of the estimated CI of the design wave height indicate that over 150 years of data is necessary in order to satisfy an approximately ${\pm}$10% CI. Also, estimating the number of practically possible data to be around 25~50, the allowable error was found to be approximately ${\pm}$16~22% for Type I PDF and ${\pm}$18~24% for Type III PDF. Whereas, the Kernel distribution method, a typical non-parametric method, shows that the CI of the method is below 40% in comparison with the CI of the other methods and the estimated design wave height is 1.2~1.6 m lower than that of the other methods.

• Journal of Korean Neurosurgical Society
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• v.63 no.5
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• pp.598-606
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• 2020

Objective : The purpose of this study was to evaluate the impact of time interval between index event and stenting on the periprocedural risk of stenting for symptomatic carotid stenosis and to determine the optimal timing of stenting. Methods : This retrospective study included 491 (322 symptomatic [65.6%] and 169 asymptomatic [34.4%]) patients undergoing carotid stenting. The symptomatic patients were categorized into Day 0-3, 4-7, 8-10, 11-14, 15-21, and >21 groups according to the time interval between index event and stenting. Periprocedural (≤30 days) risk for clinical (any neurological deterioration) and radiological (new infarction on postprocedural diffusion-weighted imaging) events of stenting in each time interval versus asymptomatic stenosis was calculated with logistic regression analysis adjusted for confounders, and provided as odds ratio (OR) and 95% confidence interval (CI). Results : Overall clinical event rate (4.3%) of stenting for symptomatic carotid stenosis was higher than that for asymptomatic stenosis (1.2%; OR, 3.979 [95% CI, 1.093-14.489]; p=0.036). Stenting in Day 0-3 (13.2%; OR, 10.997 [95% CI, 2.333-51.826]; p=0.002) and Day 4-7 (8.3%; OR, 6.775 [95% CI, 1.382-33.227]; p=0.018) was associated with high risk for clinical events. However, the clinical event rates in stenting after 7 days from index event (Day 8-10, 1.8%; Day 11-14, 2.5%; Day 15-21, 0%; Day >21, 2.9%) were not different from that in stenting for asymptomatic stenosis. Overall radiological event rate (55.6%) in symptomatic stenosis was also higher than that in asymptomatic stenosis (35.5%; OR, 2.274 [95% CI, 1.553-3.352]; p<0.001). The high risk for radiological events was maintained in all time intervals (Day 0-3 : 55.3%; OR, 2.224 [95% CI, 1.103-4.627]; p=0.026; Day 4-7 : 58.3%; OR, 2.543 [95% CI, 1.329-4.949]; p=0.005; Day 8-10 : 53.6%; OR, 2.096 [95% CI, 1.138-3.889]; p=0.018; Day 11-14 : 57.5%; OR, 2.458 [95% CI, 1.225-5.021]; p=0.012; Day 15-21 : 55.6%; OR, 2.271 [95% CI, 1.099-4.764]; p=0.028; Day >21 : 54.8%; OR, 2.203 [95% CI, 1.342-3.641]; p=0.002). Conclusion : This study showed that as stenting was delayed, the periprocedural risk for clinical events decreased. The clinical event risk was high only in stenting within 7 days and comparable with that for asymptomatic stenosis in stenting after 7 days from index event, although the radiological event risk was not affected by stenting timing. Therefore, our results suggest that delayed stenting after 7 days from symptom onset is a safe strategy for symptomatic stenosis.