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Probability Model of Massive Hemorrhage in Patients with Placenta Previa

Choi MG, Kim JW, Jin WH, Kim YH

Objective: The aim of this study was to identify the factors affecting massive hemorrhages in patients with placenta previa. We also made probability models and equations for massive hemorrhage. Methods: Seven...
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Introduction to Mediation Analysis and Examples of Its Application to Real-world Data

Jung SJ

Traditional epidemiological assessments, which mainly focused on evaluating the statistical association between two major components-the exposure and outcome-have recently evolved to ascertain the in-between process, which can explain the underlying...
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The application of machine learning for predicting recurrence in patients with early-stage endometrial cancer: a pilot study

Akazawa M, Hashimoto K, Noda K, Yoshida K

Objective Most women with early stage endometrial cancer have a favorable prognosis. However, there is a subset of patients who develop recurrence. In addition to the pathological stage, clinical and therapeutic...
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Understanding the genetics of systemic lupus erythematosus using Bayesian statistics and gene network analysis

Nam SW, Lee KS, Yang JW, Ko Y, Eisenhut M, Lee KH, Shin JI, Kronbichler A

The publication of genetic epidemiology meta-analyses has increased rapidly, but it has been suggested that many of the statistically significant results are false positive. In addition, most such meta-analyses have...
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The Impact of Primary Tumor Resection on Survival in Asymptomatic Colorectal Cancer Patients With Unresectable Metastases

Doah KY, Shin US, Jeon BH, Cho SS, Moon SM

Purpose: This study was conducted to evaluate the effectiveness of primary tumor resection (PTR) in asymptomatic colorectal cancer (CRC) patients with unresectable metastases using the inverse probability of treatment weighting...
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Implications of Alterations in Pre-test Probability in the 2019 Update of ESC Guidelines for Chronic Coronary Syndromes on Diagnostic Accuracy of Pharmacological StressEchocardiography: A Retrospective Cohort Study

Dykun I, Hendricks S, Balcer B, Totzeck M, Al-Rashid F, Rassaf T, Mahabadi AA

BACKGROUND: With the 2019 update of European Society of Cardiology (ESC) guidelines for chronic coronary syndromes, the pre-test probabilities (PTPs) based on age, sex, and symptoms have undergone major revisions....
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Analysis of Sexual Behaviors among Adults in Korea: Results from the “Korean National Survey on Sexual Consciousness”

Ahn ST, Kim JW, Park HS, Kim HJ, Park HJ, Ahn HS, Lee SW, Moon DG

Purpose: This study aimed to understand the characteristics of sexual behaviors among Korean adults to facilitate the development of strategies and policies focused on sexual health in groups categorized by...
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More about the basic assumptions of t-test: normality and sample size

Kim TK, Park JH

Most parametric tests start with the basic assumption on the distribution of populations. The conditions required to conduct the t-test include the measured values in ratio scale or interval scale,...
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Drawing Guideline for JKMS Manuscript (01) Kaplan-Meier Curve and Survival Analysis

Kim J

The appropriate plot effectively conveys the author's conclusions to readers. Journal of Korean Medical Science will provide a series of special articles to show you how to make consistent and...
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Establishment of Maximum Surgical Blood Order Schedule (MSBOS) and Evaluation of Effective Blood Usage in Major Surgery

Jeon YL, Lee WI, Kang SY, Kim MH

BACKGROUND: For effective blood usage and reduction of unnecessary workload at blood banks, we established the maximum surgical blood order schedule (MSBOS) for major elective surgeries and evaluated indicators, including...
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Human Error Probability Assessment During Maintenance Activities of Marine Systems

Islam R, Khan F, Abbassi R, Garaniya V

BACKGROUND: Maintenance operations on-board ships are highly demanding. Maintenance operations are intensive activities requiring high manemachine interactions in challenging and evolving conditions. The evolving conditions are weather conditions, workplace temperature,...
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Performance of APACHE IV in Medical Intensive Care Unit Patients: Comparisons with APACHE II, SAPS 3, and MPMâ‚€ III

Ko M, Shim M, Lee SM, Kim Y, Yoon S

BACKGROUND: In this study, we analyze the performance of the Acute Physiology and Chronic Health Evaluation (APACHE) II, APACHE IV, Simplified Acute Physiology Score (SAPS) 3, and Mortality Probability Model...
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Probability of causation for occupational cancer after exposure to ionizing radiation

Kim EA, Lee E, Kang SK, Jeong M

BACKGROUND: Probability of causation (PC) is a reasonable way to estimate causal relationships in radiation-related cancer. This study reviewed the international trend, usage, and critiques of the PC method. Because...
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Components of the item selection algorithm in computerized adaptive testing

Han KC

Computerized adaptive testing (CAT) greatly improves measurement efficiency in high-stakes testing operations through the selection and administration of test items with the difficulty level that is most relevant to each...
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Pre-hypertension and the risk of diabetes mellitus incidence using a marginal structural model in an Iranian prospective cohort study

Khosravi A, Emamian MH, Hashemi H, Fotouhi A

OBJECTIVES: The aim of this study was to evaluate the effect of pre-hypertension and its sub-classification on the development of diabetes. METHODS: In this cohort study, 2,941 people 40 to 64...
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Probability Model of Blood Transfusion for Cesarean Delivery Complicated by Placenta Previa

Kim YH, Noh EJ, Moon JH, Kim JW

OBJECTIVE: The aim of the study was to identify predictive factors for blood transfusion in women with placenta previa. Also, we construct the equation of probability of blood transfusion with...
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Central limit theorem: the cornerstone of modern statistics

Kwak SG, Kim JH

According to the central limit theorem, the means of a random sample of size, n, from a population with mean, µ, and variance, σ², distribute normally with mean, µ, and...
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Statistical basis for pharmacometrics: random variables and their distribution functions, expected values, and correlation coefficient

Choi K

For pharmacometricians, probability theory is the very first obstacle towards the statistics since it is solely founded on mathematics. The purpose of this tutorial is to provide a simple version...
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Two-and-a-half year follow-up study of strategy factors in successful learning to predict academic achievements in medical education

Lee SO, Lee SY, Baek S, Woo JS, Im SJ, Yune SJ, Lee SH, Kam B

PURPOSE: We performed a two-and-a-half year follow-up study of strategy factors in successful learning to predict academic achievements in medical education. METHODS: Strategy factors in successful learning were identified using a...
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Proposition and Application of a Dish-Based Target Pattern for Korean Adolescent Girls

Park MJ, Kim Y

OBJECTIVES: Maintaining a balanced diet and thus health is crucial for adolescents, and the first step for balanced diet practice is meal planning. Adolescents, however, find it difficult to plan...
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