• Communications for Statistical Applications and Methods
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• 제10권3호
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• pp.779-793
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• 2003

In this paper, various methods for finding confidence intervals for common odds ratio $\psi$ of the K 2${\times}$2 tables are reviewed. Also we propose two jackknife confidence intervals and bootstrap confidence intervals for $\psi$. These confidence intervals are compared with the other existing confidence intervals by using Monte Carlo simulation with respect to the average coverage probability.

• Journal of the Korean Data and Information Science Society
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• 제17권4호
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• pp.1067-1076
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• 2006

Although the proportional hazards model is the most common approach used for studying the relationship of event times and covariates, alternative models are needed for occasions when it does not fit data. In the two-sample case, proportional odds models are useful for fitting data whose hazard rates converge asymptotically. In this thesis, we propose a new estimator of the relative odds ratio of the proportional odds model when two independent random samples are observed under uncensorship. We prove the asymptotic normality and consistency of the estimator by using martingale-representation. The efficiency of the proposed is assessed through a simulation study.

• Communications for Statistical Applications and Methods
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• 제10권2호
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• pp.479-496
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• 2003

We investigate logit confidence intervals for the odds ratio based on the delta method. These intervals are constructed using pseudo-Bayes estimators. The Gart method and Agresti method smooth the observed counts toward the model of equiprobability and independence, respectively. We obtain better coverage probability by smoothing the observed counts toward the pseudo-Bayes estimators in 2$\times$2 table. We also improve legit confidence intervals in 2$\times$2$\times$K tables by generalizing these ideas. Utilizing pseudo-Bayes estimators, we obtain better coverage probability by smoothing the observed counts toward the conditional independence model, no three-factor interaction model and saturated model in 2$\times$2$\times$K tables.

• Tuberculosis and Respiratory Diseases
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• 제54권1호
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• pp.5-14
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• 2003

연구배경 : ICOPER 보고에 의하면 급성 폐혈전색전증 발생 3개월내 사망률이 17.4%이며, 일본 조사에서는 사망률이 14%라고 보고하였다. 그러나 국내에서는 급성 폐혈전색전증의 전국 규모의 대단위 연구가 없어서, 그 현황에 대해 보고된 바 없었다. 따라서 본 학회에서는 급성 폐혈전색전증에 대한 전국 실태조사를 시행하였다. 방법 : 1998년 1월 1일부터 2000년 12월 31일까지 전국수련병원급 이상 종합병원에서 급성 폐혈전색전증으로 진단받은 환자를 대상으로 역학적 특성, 임상양상, 진단법, 위험인자, 치료, 임상경과 등을 조사하였다. 결과 : 환자들의 평균연령은 $58.3({\pm}16.3)$세 였고, 남자가 40.3%였다. 발생 위험인자로는 장기간의 부동상태, 수술, 악성종양이 각각 22.9, 19.2, 15.8% 였다. 가장 흔한 증상으로는 호흡곤란과 흉통이었다. 진단을 위한 검사방법으로는 폐관류 스캔을 시행한 경우가 가장 많았다. 흉부 방사선 검사상 정상 소견을 보인 경우가 53.5%로 가장 많았고, 이상 소견으로는 흉막 삼출액이 가장 흔하였다. 치료방법으로는 86.8%에서 헤파린 항 응고법을 시행하였고 혈전 용해요법은 시행한 경우는 12.3%였다. 사망을 예측할 수 있는 인자로는 병원내에서 이환된 경우, 폐암, 빈호흡, 쇼크, 청색증의 5가지로 분석되었고, 사망 위험도는 각각 1.88, 9.20, 3.50, 6.74, 3.45배 였다. 전체 사망률은 16.9%였고 그 중에서 급성 폐혈전색전증과 연관된 사망률은 9.0%였다. 결론 : 본 조사는 급성 폐혈전색전증에 대한 최초의 전국규모의 실태조사로서, 이 결과가 향후 국내 급성폐혈전색전증의 연구와 치료에 기여할 수 있을 것으로 사료된다.

• 보건의료산업학회지
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• 제7권3호
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• pp.287-296
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• 2013

The aim of this study was to compare the regional difference of death from intentional self-harm. The analysis was based on data of intentional self-harm deaths (31,450) from the 2010-2011 vital statistics of Korea. The suicide rate (per 100,000 population) was 46.2 in male and 22.3 in female. Gender ratio (male / female) of suicide rate was 2.07, and Jeju province had the lowest gender ratio (1.82), and Chungbuk province had the highest gender ratio (2.42). In the age-gender standardized death rate (per 100,000) of self-harm by region, the highest suicide rate was observed in Gangwon province (44.8) and Chungnam province (44.3), and the lowest in Seoul metropolitan city (28.9) and Ulsan metropolitan city (29.2). There was a significant increase in the rate of suicide in city areas (odds ratio: 1.11, 95% CI: 1.08-1.13), county areas (1.62, 1.56-1.67) as compared with the rate of suicide in metropolitan areas. The commonest methods of suicide were hanging (53.7 percent), self-poisoning by pesticides (16.8 percent) and jumping from a height (14.3 percent). The methods used for suicide differed between rural (county) and urban areas (metropolitan city and city). In county areas, 43 percent of suicides used pesticides as compared to only 7-18 percent of those in urban areas. In urban areas, jumping was more common (13-17 percent vs. 6 percent). There were no difference in hanging between urban and rural areas. The odds ratio of death by pesticides was 9.86 in rural areas compared with death rate of metropolitan areas. The odds ratio of death by jumping was 0.59 in rural compared with death rate of metropolitan areas.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제11권2호
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• pp.110-115
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• 2008

목 적: 장중첩증의 일차적인 치료로 사용되는 비수술적 관장 정복은 장천공, 쇼크 그리고 복막염 등과 같은 심각한 합병증과 불필요한 스트레스 및 과도한 방사선 노출의 위험이 있다. 본 연구에서는 무리한 비수술적 정복의 시도를 피하기 위하여 장중첩증 환자의 임상 양상 및 검사 소견 중 비수술적 정복 실패를 예측할 수 있는 인자를 파악하고자 하였다. 방 법: 고려대학교 의료원 안산병원에서 1998년 3월에서 2006년 7월까지 장중첩증으로 진단되어 치료받았던 환자 314명 중 비수술적 정복이 시도되었던 300명을 대상으로 하였다. 비수술적 정복의 성공 군과 실패군으로 나누어 성별, 연령, 임상증상 및 이학적 소견 그리고 증상의 시작에서 비수술적 정복술을 시도하기까지의 시간과 비수술적 정복 실패와의 연관성을 분석하였다. 결 과: 비수술적 정복 실패 군의 경우 성공 군에 비해 연령이 어렸고(12.3${\pm}$17.2개월 vs 18.0${\pm}$15.8개월, p=0.03), 정복 시도까지의 시간 경과가 길었으며(33.6${\pm}$29.0시간 vs 21.5${\pm}$20.3시간, p<0.01), 구토, 기면은 많았음(p<0.01)에 비해 복통이나 보챔은 적었다(p<0.01). 이러한 인자들의 다중회귀분석에서 비수술적 정복 실패와 연관된 인자는 6개월 미만 연령(odds ratio: 2.5, 95% confidence interval: 1.2~5.2, p=0.01), 24시간 경과(odds ratio: 2.1, 95% confidence interval: 1.2~4.2, p=0.03), 혈변(odds ratio: 4.8, 95% confidence interval: 1.9~12.2, p<0.01), 기면(odds ratio: 3.4, 95% confidence interval: 1.1~10.4, p=0.04), 복통 또는 보챔(odds ratio: 0.2, 95% confidence interval: 0.1~0.4, p<0.01)이었다. 결 론: 장중첩증에서 6개월 미만 어린 연령, 혈변이나 기면의 소견, 증상 시작 24시간이 경과된 경우 비수술적 정복 실패의 가능성이 많으므로 이러한 사항을 충분히 고려하여 시행 여부를 결정하는 것이 좋겠다.

• 한국컴퓨터정보학회논문지
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• 제27권12호
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• pp.259-266
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• 2022

본 연구는 생활습관관리를 통하여 구강건조와 안구건조를 예방하여 통합적인 건강증진교육을 위한 기초자료를 마련하고자 한다. 2022년 10월 7일부터 17일까지 전국에 있는 20대 대학생들을 대상으로 자기기입방식의 구조화된 설문지를 통해 자발적으로 동의 후 응답한 전체 516명의 설문결과를 통계분석 하였다. 연구대상자의 생활습관 중 구강건조를 느끼게 하는 영향 요인으로는 하루 흡연량이 많을수록 구강건조를 높게(8.41±2.041), 매우 높게(7.75±2.927) 느끼는 것으로 나타났으며(p=.015), 스마트폰 사용 시간이 짧을수록 구강건조를 낮게(1.16±0.784), 매우 낮게(1.83±1.672) 느끼는 것으로 나타났다(p=.022). 구강건조와 안구건조를 느끼게하는 주요 요인으로는 구강건조를 느낄 때 안구건조를 3.651배 높게 느끼며(p=.000), 생활습관에서는 흡연량이 많아질 수록 0.916배 높게 느끼고(p=.038), 스마트폰 사용시간이 길수록 구강건조를 1.292배 높게 느낀다(p=.004). 안구건조가 있을 때 구강건조를 4.002배 높게 느끼며(p=.000), 운동의 시간이 많을수록 안구건조를 1.600배(p=.009) 느낀다. 결과적으로, 구강건조와 안구건조는 공통의 불편요인으로 나타나므로 건강생활의 유지·증진을 위하여 생활습관관리가 필요한 것으로 사료된다. 따라서 삶의 질을 향상할 수 있는 통합건강증진플랫폼이 구축되어 개인의 맞춤 건강관리 프로그램 시행이 이루어지도록 제안한다.

• Journal of Chest Surgery
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• 제48권4호
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• pp.246-251
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• 2015

Background: Upper limb ischemia is less common than lower limb ischemia, and relatively few cases have been reported. This paper reviews the epidemiology, etiology, and clinical characteristics of upper limb ischemia and analyzes the factors affecting functional sequelae after treatment. Methods: The records of 35 patients with acute and chronic upper limb ischemia who underwent treatment from January 2007 to December 2012 were retrospectively reviewed. Results: The median age was 55.03 years, and the number of male patients was 24 (68.6%). The most common etiology was embolism of cardiac origin, followed by thrombosis with secondary trauma, and the brachial artery was the most common location for a lesion causing obstruction. Computed tomography angiography was the first-line diagnostic tool in our center. Twenty-eight operations were performed, and conservative therapy was implemented in seven cases. Five deaths (14.3%) occurred during follow-up. Twenty patients (57.1%) complained of functional sequelae after treatment. Functional sequelae were found to be more likely in patients with a longer duration of symptoms (odds ratio, 1.251; p=0.046) and higher lactate dehydrogenase (LDH) levels (odds ratio, 1.001; p=0.031). Conclusion: An increased duration of symptoms and higher initial serum LDH levels were associated with the more frequent occurrence of functional sequelae. The prognosis of upper limb ischemia is associated with prompt and proper treatment and can also be predicted by initial serum LDH levels.

• 대한응급의학회지
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• 제29권5호
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• pp.423-429
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• 2018

Objective: Falling is a common cause of head injury in preschool aged children. We investigated the characteristics of mild head injuries caused by falling and the association between body weight and occurrence of traumatic brain injuries (TBI). Methods: This retrospective observational study was conducted on head-injured preschool-aged children that visited the emergency department from January 2012 to December 2015. Characteristics such as age, sex, weight, free fall height, floor type, and presence of TBI, as defined as cerebral hemorrhage or skull fracture, were investigated. We calculated body weight percentiles by calibrating age and weight and categorized them into four quartile ranges. We grouped all included cases into two groups according to the presence of TBI. The characteristics of the two groups were compared by using chi-square test, and the association with TBI was investigated by using binomial logistic regression. Results: A total of 701 children were included, and TBI was observed in 95 children. Children with TBI were younger. The proportion of children with TBI was higher in the third and fourth quartiles of the body weight group as well as according to soft floor and fall from high height (${\geq}1m$). The odds of soft floor being associated with TBI was higher than the odds for hard floor (odds ratio, 2.734; 95% confidence interval [CI], 1.597-4.680). The odds of high height (${\geq}1m$) being associated with TBI was higher than that for low height (odds ratio, 2.306; 95% CI, 1.155-4.601), and the odds ratio for the weight percentile group was 1.228 (95% CI, 1.005-1.499). Conclusion: Prevalence of TBI after falling in preschool-aged children might be associated with high fall-height and body weight quartiles.

• Journal of Preventive Medicine and Public Health
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• 제32권4호
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• pp.427-434
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• 1999

Objectives: This study was conducted to determine, by reviewing the literature, whether treatment of Helicobacter pylori infection in patients with non-ulcer dyspepsia affects symptoms. Methods: We retrieved the literature using MEDLINE search, with nonulcer dyspepsia and Hericobacter pylori and treatment as key words, which were reported from 1984 to 1998, and manual literature search. The criteria for inclusion was as follows; 1) The paper should have confirmed nonulcer dyspepsia as case definition. 2) The paper should have peformed a randomized, blind trial. 3) Confirmation of Helicobacter pylori eradication should be done 4 weeks after treatment. 4) studies with no information on measurement of symptoms after treatment were not accepted. The percentage of patients with symptom improvement after eradication therapy for Helicobacter pylori infection was calculated. Cumulative odds ratio was compared by fixed effect model and random effect model as sensitivity and funnel plot was used to evaluate publication bias. Results: The overall effect size of symptom improvement was calculated by cumulative odds ratio. Cumulative odds ratio of random effect model was 4.16(95% CI: 1.55-11.19). Before integrating each effect sizes into common effect size, the homogeneity test was conducted and random effect model was selected(Cochran's Q=41.08 (d.f=10, p<0.001)). The heterogeneity across studies was evaluated and the different methodological aspects of studies led to differences between study results Conclusions: The results suggest that the eradication of Helicobacter pylori in patients with non-ulcer dyspepsia results more symptom improvement. In studios that shows the opposite results there are methodological aspects explaining the heterogeneity.