Ai Koyanagi
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View article: Quantifying the impact of immortal time bias: empirical evidence from meta-analyses
Quantifying the impact of immortal time bias: empirical evidence from meta-analyses Open
Objectives Immortal time bias (ITB) occurs when a period during which, by design, participants cannot experience the outcome (like death) is incorrectly included in the treatment group’s follow-up, artificially making the treatment look be…
View article: Erratum to “Sex differences in the association between dynapenic abdominal obesity and onset of disability in activities of daily living among adults aged ≥50 years: A prospective analysis of the Irish Longitudinal Study on Ageing” [Maturitas 176C (2023) 107763]
Erratum to “Sex differences in the association between dynapenic abdominal obesity and onset of disability in activities of daily living among adults aged ≥50 years: A prospective analysis of the Irish Longitudinal Study on Ageing” [Maturitas 176C (2023) 107763] Open
View article: Association Between Unclean Cooking Fuel Use and Hearing Problems Among Adults Aged ≥ 65 Years, a Cross‐Sectional Study
Association Between Unclean Cooking Fuel Use and Hearing Problems Among Adults Aged ≥ 65 Years, a Cross‐Sectional Study Open
Background and Aims Literature suggests that outdoor air pollutant exposure is associated with hearing problems, but examination of this link has not extended to any potential association between hearing ability and the use of unclean cook…
View article: Temporal Trends in Inadequate Vegetable and Fruit Consumption Among Adolescents Aged 12–15 Years From 31 Countries in Asia, Africa, and the Americas
Temporal Trends in Inadequate Vegetable and Fruit Consumption Among Adolescents Aged 12–15 Years From 31 Countries in Asia, Africa, and the Americas Open
Background and Aims A low intake of fruit and vegetable consumption has been found to be associated with a plethora of negative health outcomes in adolescents. However, there is a scarcity of literature on long‐term trends in fruit and veg…
View article: The association between physical multimorbidity and fall-related injury among adults aged ≥ 50 years from low- and middle-income countries
The association between physical multimorbidity and fall-related injury among adults aged ≥ 50 years from low- and middle-income countries Open
Studies from high-income countries have shown that multimorbidity is associated with increased fall risk among older adults. However, studies specifically on this topic from low- and middle-income counties (LMICs) are lacking. Thus, we aim…
View article: Occupational physical activity and mortality risk among 756 377 adults: A prospective cohort register-based study with 13 years follow-up
Occupational physical activity and mortality risk among 756 377 adults: A prospective cohort register-based study with 13 years follow-up Open
Background: Recent research from Nordic countries observed higher levels of occupational physical activity (OPA) to increase mortality risk. However, research is required to clarify generalizability to other countries as several studies ha…
View article: Sex-stratified mortality estimates in people with schizophrenia: A systematic review and meta-analysis of cohort studies of 2,700,825 people with schizophrenia
Sex-stratified mortality estimates in people with schizophrenia: A systematic review and meta-analysis of cohort studies of 2,700,825 people with schizophrenia Open
View article: Collaborative Outcomes Study on Health and Functioning During Infection Times (COH-FIT): Global and Risk-Group Stratified Course of Well-Being and Mental Health During the COVID-19 Pandemic in Adolescents
Collaborative Outcomes Study on Health and Functioning During Infection Times (COH-FIT): Global and Risk-Group Stratified Course of Well-Being and Mental Health During the COVID-19 Pandemic in Adolescents Open
View article: Machine Learning–Based Prediction for Incident Hypertension Based on Regular Health Checkup Data: Derivation and Validation in 2 Independent Nationwide Cohorts in South Korea and Japan
Machine Learning–Based Prediction for Incident Hypertension Based on Regular Health Checkup Data: Derivation and Validation in 2 Independent Nationwide Cohorts in South Korea and Japan Open
Background Worldwide, cardiovascular diseases are the primary cause of death, with hypertension as a key contributor. In 2019, cardiovascular diseases led to 17.9 million deaths, predicted to reach 23 million by 2030. Objective This study …
View article: Machine Learning–Based Prediction of Neurodegenerative Disease in Patients With Type 2 Diabetes by Derivation and Validation in 2 Independent Korean Cohorts: Model Development and Validation Study
Machine Learning–Based Prediction of Neurodegenerative Disease in Patients With Type 2 Diabetes by Derivation and Validation in 2 Independent Korean Cohorts: Model Development and Validation Study Open
Background Several machine learning (ML) prediction models for neurodegenerative diseases (NDs) in type 2 diabetes mellitus (T2DM) have recently been developed. However, the predictive power of these models is limited by the lack of multip…
View article: Collaborative outcomes study on health and functioning during infection times (COH-FIT): Insights on modifiable and non-modifiable risk and protective factors for wellbeing and mental health during the COVID-19 pandemic from multivariable and network analyses
Collaborative outcomes study on health and functioning during infection times (COH-FIT): Insights on modifiable and non-modifiable risk and protective factors for wellbeing and mental health during the COVID-19 pandemic from multivariable and network analyses Open
View article: National Trends in the Prevalence of Unmet Health Care and Dental Care Needs During the COVID-19 Pandemic: Longitudinal Study in South Korea, 2009-2022
National Trends in the Prevalence of Unmet Health Care and Dental Care Needs During the COVID-19 Pandemic: Longitudinal Study in South Korea, 2009-2022 Open
Background Although previous studies have investigated trends in unmet health care and dental care needs, most have focused on specific groups, such as patients with chronic conditions and older adults, and have been limited by smaller dat…
View article: Evaluation of HER2 immunohistochemistry-positive and immunohistochemistry-negative FISH amplification breast cancers using next-generation sequencing
Evaluation of HER2 immunohistochemistry-positive and immunohistochemistry-negative FISH amplification breast cancers using next-generation sequencing Open
Objectives In this study, we aimed to assess the concordance between HER2 positivity, defined as scores of 2+ or 3+ by immunohistochemistry (IHC), and HER2 gene amplification results obtained by fluorescence in situ hybridization (FISH) an…
View article: Teriparatide in postmenopausal osteoporosis: uncovering novel insights into efficacy and safety compared to other treatments – a systematic review and meta-analysis
Teriparatide in postmenopausal osteoporosis: uncovering novel insights into efficacy and safety compared to other treatments – a systematic review and meta-analysis Open
Objective The aim of the study was to evaluate the efficacy and safety of teriparatide compared to other treatments for postmenopausal osteoporosis. Methods A review of studies from 2000 to January 2023 analyzed randomized controlled trial…
View article: Association between sedentary behavior and wish to die among adults aged ≥50 years: Findings from the Irish Longitudinal Study on Ageing
Association between sedentary behavior and wish to die among adults aged ≥50 years: Findings from the Irish Longitudinal Study on Ageing Open
View article: Mild Cognitive Impairment and Suicidal Ideation Among Adults Aged 65 Years or Older From Low- and Middle-Income Countries
Mild Cognitive Impairment and Suicidal Ideation Among Adults Aged 65 Years or Older From Low- and Middle-Income Countries Open
Objectives Mild cognitive impairment (MCI) is a unique indicator of underlying distress that may be strongly associated with suicide risk. Despite this, to date, no study has examined the association between MCI and suicidal ideation. Ther…
View article: National and Regional Trends in the Prevalence of Hypertension in South Korea Amid the Pandemic, 2009-2022: Nationwide Study of Over 3 Million Individuals
National and Regional Trends in the Prevalence of Hypertension in South Korea Amid the Pandemic, 2009-2022: Nationwide Study of Over 3 Million Individuals Open
Background Understanding the association between hypertension prevalence and socioeconomic and behavioral variables during a pandemic is essential, and this analysis should extend beyond short-term trends. Objective This study aims to exam…
View article: Is unicompartmental knee arthroplasty a better choice than total knee arthroplasty for unicompartmental osteoarthritis? A systematic review and meta-analysis of randomized controlled trials
Is unicompartmental knee arthroplasty a better choice than total knee arthroplasty for unicompartmental osteoarthritis? A systematic review and meta-analysis of randomized controlled trials Open
Background: The choice of unicompartmental knee arthroplasty (UKA) vs . total knee arthroplasty (TKA) in the surgical treatment of knee osteoarthritis (KOA) remains controversial. This study aimed to perform a systematic review and meta-an…
View article: Efficacy and safety of zoledronic acid in the treatment of osteoporosis: A meta-analysis of randomized controlled trials
Efficacy and safety of zoledronic acid in the treatment of osteoporosis: A meta-analysis of randomized controlled trials Open
View article: Prediction model for cardiovascular disease in patients with diabetes using machine learning derived and validated in two independent Korean cohorts
Prediction model for cardiovascular disease in patients with diabetes using machine learning derived and validated in two independent Korean cohorts Open
View article: Impact of the 2008 economic crisis on the burden of hepatitis B and C diseases in Southern European countries
Impact of the 2008 economic crisis on the burden of hepatitis B and C diseases in Southern European countries Open
View article: Association between self-reported visual symptoms (suggesting cataract) and self-reported fall-related injury among adults aged ≥ 65 years from five low- and middle-income countries
Association between self-reported visual symptoms (suggesting cataract) and self-reported fall-related injury among adults aged ≥ 65 years from five low- and middle-income countries Open
View article: Association between sedentary behavior and dynapenic abdominal obesity among older adults from low- and middle-income countries
Association between sedentary behavior and dynapenic abdominal obesity among older adults from low- and middle-income countries Open
Background Sedentary behavior, or time spent sitting, may increase risk for dynapenic abdominal obesity (DAO), but there are currently no studies on this topic. Aims Therefore, we investigated the association between sedentary behaviour an…
View article: Effects of therapeutic ultrasound in patients with knee osteoarthritis: A systematic review and meta-analysis
Effects of therapeutic ultrasound in patients with knee osteoarthritis: A systematic review and meta-analysis Open
Therapeutic US may be a safe and effective treatment for patients with KOA. The mode, intensity, frequency, and duration of US may affect the effectiveness of pain relief. Pulsed US with an intensity ≤2.5 W/cm2, 24 sessions, and…
View article: Prenatal opioid exposure and subsequent risk of neuropsychiatric disorders in children: nationwide birth cohort study in South Korea
Prenatal opioid exposure and subsequent risk of neuropsychiatric disorders in children: nationwide birth cohort study in South Korea Open
Summary Objective To investigate the potential association between prenatal opioid exposure and the risk of neuropsychiatric disorders in children. Design Nationwide birth cohort study. Setting From 1 January 2009 to 31 December 2020, birt…
View article: National prevalence of smoking among adolescents at tobacco tax increase and COVID-19 pandemic in South Korea, 2005–2022
National prevalence of smoking among adolescents at tobacco tax increase and COVID-19 pandemic in South Korea, 2005–2022 Open
Prior research has predominantly focused on the overall effects of the tobacco tax increase and the COVID-19 pandemic on adolescent smoking behavior. However, there is a need to examine both the immediate and sustained associations of thes…
View article: Incident allergic diseases in post-COVID-19 condition: multinational cohort studies from South Korea, Japan and the UK
Incident allergic diseases in post-COVID-19 condition: multinational cohort studies from South Korea, Japan and the UK Open
As mounting evidence suggests a higher incidence of adverse consequences, such as disruption of the immune system, among patients with a history of COVID-19, we aimed to investigate post-COVID-19 conditions on a comprehensive set of allerg…
View article: Social Media Addiction Predicts Compromised Mental Health as well as Perceived and Objective Social Isolation in Denmark: A Longitudinal Analysis of a Nationwide Survey Linked to Register Data
Social Media Addiction Predicts Compromised Mental Health as well as Perceived and Objective Social Isolation in Denmark: A Longitudinal Analysis of a Nationwide Survey Linked to Register Data Open
Social media addiction has previously been linked to compromised mental health and social isolation; however, most studies are cross-sectional or based on convenience samples. The objective of the current study was to assess the extent to …
View article: Issue Information
Issue Information Open
There is more to disposable endoscopes than whether they
View article: Association of handgrip strength with suicidal ideation among adults aged ≥50 years from low‐ and middle‐income countries
Association of handgrip strength with suicidal ideation among adults aged ≥50 years from low‐ and middle‐income countries Open
Introduction This study aimed to investigate the association between handgrip strength and suicidal ideation in representative samples of adults aged ≥50 years from six LMICs (China, Ghana, India, Mexico, Russia, and South Africa). Methods…