Risk factors for middle ear cholesteatoma surgery based on Korean population data.

Background: Studies of risk factors for middle ear cholesteatoma surgery using population-based data are lacking.

Objectives: To investigate the risk factors for cholesteatoma surgery in adults based on population data from Korea.

Materials And Methods: For this retrospective study, we used Korean National Health Insurance Service National Sample Cohort data.

Seasonal variation in peripheral vestibular disorders based on Korean population data.

Objectives: Comprehensive studies in which the seasonal variation in peripheral vestibular disorders was evaluated using data from an entire population are insufficient. The seasonal variation in peripheral vestibular disorders based on data from the entire Korean population was investigated in the present study.

Methods: Retrospective data from the National Health Insurance Service of Korea from 2008 to 2020 was analyzed.

Perinatal and childhood outcomes of children born to female cancer survivors in South Korea.

Despite the increasing number of female cancer survivors, uncertainty remains regarding potential adverse health outcomes for their offspring. Comprehensive population-based studies would be invaluable for female cancer survivors in making decisions about their future. This study uses the National Health Information Database to investigate perinatal and long-term outcomes of offspring born to mothers with a history of cancer.

Reference Standard for Digital Infrared Thermography of the Surface Temperature of the Lower Limbs.

Digital infrared thermographic imaging (DITI) is a supplementary diagnostic technique to visualize the surface temperature of the human body. However, there is currently no reference standard for the lower limbs for accurate diagnosis. In this study, we performed DITI on the lower limbs of 905 healthy Korean volunteers (411 males and 494 females aged between 20 and 69 years) to obtain reference standard data.

Incidence of peripheral vestibular disorders based on population data of South Korea.

Background: There have been no comprehensive studies on the incidence of peripheral vestibular disorders based on population-based data for a long-term period.

Objective: We investigated the incidence of peripheral vestibular disorders using population-based data representing the whole population of South Korea.

Methods: This study used the National Health Insurance Service data in Korea from 2008 to 2020.

Long-term outcomes of preterm infants in the first 6 years of life: a nationwide population-based study in Korea.

Unlabelled: This study examined the relationship between gestational age and long-term outcomes up to 6 years of age using population-based big data from the National Health Insurance Service in Korea. This retrospective observational cohort study used data from the National Health Information Database (2011-2017). All children born in Korea during 2011 (January 1-December 31) were eligible and were followed up until 2017.

Anemia Is a Risk Factor for the Development of Ischemic Stroke and Post-Stroke Mortality.

Background: anemia is known to be a risk factor for developing ischemic stroke in long-term follow-up studies, and it is also known to increase the risk of death in ischemic stroke patients. We aimed to determine the association of anemia with the risk of ischemic stroke and the risk of death after ischemic stroke.

Methods: The study included patients from National Health Insurance Service cohort, from January 2005 to December 2015.

Neonatal and maternal risk factors for hearing loss in children based on population-based data of Korea.

Objectives: We identified the neonatal and maternal risk factors for hearing loss (HL) in children using National Health Insurance Service data of Korea.

Methods: We retrospectively analyzed data from the National Health Insurance Service. Infants born from 2007 to 2013 were tracked to 2015.

Risk factors for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections: a nationwide population-based study.

Background: The coronavirus disease 2019 (COVID-19) has rapidly turned into a public health emergency worldwide; however, the risk factors for infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) have not been well-described. We aimed to identify the clinical risk factors for SARS-CoV-2 infections in Korea, where social distancing and face masks have been strongly recommended.

Methods: The data of individuals who underwent the reverse transcription polymerase chain reaction test for SARS-CoV-2 between January 3 and May 31, 2020 were retrieved from the Health Insurance Review and Assessment Service dataset.

Effects of BMI and LDL-cholesterol change pattern on cardiovascular disease in normal adults and diabetics.

Introduction: To examine how the risk of cardiovascular disease changes according to degree of change in body mass index (BMI) and low-density lipoprotein (LDL)-cholesterol in patients with diabetes using the health medical examination cohort database of the National Health Insurance Service in Korea. In comparison, the pattern in a non-diabetic control group was also examined.

Research Design And Methods: The study samples were 13 800 patients with type 2 diabetes and 185 898 non-diabetic controls, and their baseline characteristics and repeatedly measured BMI and LDL-cholesterol until occurrence of cardiovascular disease were collected in longitudinal data.

Panoramic radiography can be an effective diagnostic tool adjunctive to oral examinations in the national health checkup program.

Purpose: We investigated correlations between the findings of oral examinations and panoramic radiography in order to determine the efficacy of using panoramic radiographs in screening examinations.

Methods: This study included patients who visited dental clinics at National Health Insurance Service (NHIS) Ilsan Hospital for checkups during 2009-2015 and underwent panoramic radiographic examinations within 1 year prior to the oral examinations. Among the 48,006 patients who received checkups, 1,091 were included in this study.

Association between periodontal disease and non-communicable diseases: A 12-year longitudinal health-examinee cohort study in South Korea.

The National Health Insurance Service-Health Examinee Cohort during 2002 to 2013 was used to investigate the associations between periodontal disease (PD) and the following non-communicable diseases (NCDs): hypertension, diabetes mellitus, osteoporosis, cerebral infarction, angina pectoris, myocardial infarction, and obesity.Univariate and multivariate logistic regression analyses adjusting for potential confounders during the follow-up period-including age, sex, household income, insurance status, residence area, health status, and comorbidities-were used to estimated odds ratios (ORs) with 95% confidence intervals (CIs) in order to assess the associations between PD and NCDs.We enrolled 200,026 patients with PD and 154,824 subjects with a healthy oral status.

Development of methane and nitrous oxide emission factors for the biomass fired circulating fluidized bed combustion power plant.

This study makes use of this distinction to analyze the exhaust gas concentration and fuel of the circulating fluidized bed (CFB) boiler that mainly uses wood biomass, and to develop the emission factors of Methane (CH(4)), Nitrous oxide (N(2)O). The fuels used as energy sources in the subject working sites are Wood Chip Fuel (WCF), RDF and Refused Plastic Fuel (RPF) of which heating values are 11.9 TJ/Gg, 17.