Publications by authors named "Ka-Chun Chong"

Previous epidemiological studies have shown that diabetes is associated with an increased risk of several cancers, including bladder cancer. However, prediction models for bladder cancer among diabetes patients remain scarce. This study aims to develop a scoring system for bladder cancer risk prediction among diabetes patients who receive routine care in general outpatient clinics using a machine learning-guided approach.

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Background: The emergence of SARS-CoV-2 variants necessitates ongoing evaluation of vaccine performance. This study evaluates and compares the safety and immunogenicity of the Comirnaty and Spikevax monovalent XBB.1.

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Background: The effect of nirmatrelvir-ritonavir on post-COVID-19 outcomes for individuals who are immunocompromised is understudied. We aimed to examine the association of nirmatrelvir-ritonavir with post-acute sequelae and mortality among patients who are immunocompromised and admitted to hospital with COVID-19.

Methods: We did a retrospective cohort study using territory-wide electronic health records from the Hong Kong Hospital Authority and Hong Kong Department of Health.

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While previous research examined coronavirus disease 2019 (COVID-19) antiviral-vaccine interactions through exploratory subgroup analysis, none specifically designed for examining this interaction or its impact on post-acute outcomes. This study examined the interaction between nirmatrelvir-ritonavir and complete COVID-19 vaccination on reducing the risk of post-acute outcomes among COVID-19 patients. We followed COVID-19 patients hospitalized between 11 March 2022 and 10 October 2023, until 31 October 2023 in Hong Kong.

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Heat-health warning systems and services are important preventive actions for extreme heat, however, global evidence differs on which temperature indicator is more informative for heat-health outcomes. We comprehensively assessed temperature predictors on their summer associations with adverse health impacts in a high-density subtropical city. Maximum, mean, and minimum temperatures were examined on their associations with non-cancer mortality and hospital admissions in Hong Kong during summer seasons 2010-2019 using Generalized Additive Models and Distributed Lag Non-linear Models.

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Objective: To determine the correlation, precision, mean percentage difference and agreement between cardiac indices (stroke volume [SV], cardiac output [CO], SV index [SVI], and cardiac index [CI]) measured by noninvasive cardiac output monitor (NICOM, Cheetah Medical, Boston, MA, USA) and 2-dimensional transthoracic echocardiography (2D-TTE) across gestations in Chinese pregnant women.

Methods: This was a prospective longitudinal study performed in women with singleton pregnancy at 11-14 ( = 152), 19-24 ( = 152), 30-34 ( = 141), and 35-37 ( = 103). Cardiac indices, including CO and SV, were obtained by NICOM, which uses thoracic bioreactance, and 2D-TTE.

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Objectives: As the SARS-CoV-2 virus evolves more rapidly than vaccines are updated, T cell immunity potentially confers protection against disease progression and death from new variants. In this study, we aimed to assess whether the current boosting vaccination schemes offer sufficient T cell protection against new SARS-CoV-2 variants.

Methods: A total of 292 adults who had received the second booster of either monovalent wild-type (WT) vaccines (inactivated virus or mRNA) (Cohort 1) or the second/third booster of bivalent WT/BA.

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Background: Colorectal cancer (CRC) is the third most frequently diagnosed cancer worldwide. Diabetes and CRC share many overlapping lifestyle risk factors such as obesity, heavy alcohol use, and diet. This study aims to develop a risk scoring system for CRC prediction among diabetes patients using routine medical records.

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Background: Multiple studies have reported the profound influence of various climate factors on dengue fever infection, while the effects of joint exposure to warm and wet environment, a condition favouring dengue vectors, on disease transmission were less evaluated. This study aims to investigate the impact of various compound temperature, rainfall, and relative humidity exposures on dengue fever infection in the South and Southeast Asia regions.

Methods: Weekly dengue fever surveillance data from 2012 to 2020 were collected from 48 locations in four countries named Singapore (1 location), Sri Lanka (15 locations), Malaysia (9 locations), and Thailand (23 locations, with 11 locations having different study periods).

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Background: Understanding the global burden of enteric infections is crucial for prioritizing control strategies for foodborne and waterborne diseases. This study aimed to assess the global burden of enteric infections in 2021 and identify risk factors from One Health aspects.

Methods: Leveraging the Global Burden of Disease (GBD) 2021 database, the incidence, disability-adjusted life years (DALYs), and deaths of enteric infections and the subtypes were estimated, including diarrheal diseases, typhoid and paratyphoid fever, invasive non-typhoidal (iNTS) infections, and other intestinal infectious diseases.

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Background: Most liver cancer scoring systems focus on patients with preexisting liver diseases such as chronic viral hepatitis or liver cirrhosis. Patients with diabetes are at higher risk of developing liver cancer than the general population. However, liver cancer scoring systems for patients in the absence of liver diseases or those with diabetes remain rare.

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Background: The available evidence presented inconsistencies and inconclusive findings regarding the associations between co-existing asthma and mortality among COVID-19 patients. The objective of the current study is to investigate the relationship between asthma and severe outcomes after SARS-CoV-2 Omicron infection in an infection-naïve population.

Methods: A retrospective cohort study using propensity score matching was conducted.

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Background: The COVID-19 pandemic has led to decreased measles vaccination rates globally, exacerbating vaccine hesitancy. This study examines the relationship between COVID-19 vaccine acceptance and childhood measles vaccination among parents in Hong Kong.

Methods: A cross-sectional online survey was conducted in Hong Kong from March to September 2022.

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Background: Acute otitis media (AOM) is a prevalent childhood acute illness, with 13.6 million pediatric office visits annually, often stemming from upper respiratory tract infections (URI) and affected by environmental factors like air pollution and cold seasons.

Methods: Herein, we made use of territory-wide hospitalization data to investigate the relationships between meteorological factors, air pollutants, influenza infection, and AOM for children observed from 1998 to 2019 in Hong Kong.

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Febrile seizures are convulsions predominately occurring in young children. The effects of various exposomes, including influenza infection and external environmental factors, on febrile seizures have not been well-studied. In this study, we elucidated the relationships between ambient temperature, air pollutants, influenza infection, and febrile seizures using 22-year territory-wide hospitalization data in Hong Kong.

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Background: While many investigations examined the association between environmental covariates and COVID-19 incidence, none have examined their relationship with superspreading, a characteristic describing very few individuals disproportionally infecting a large number of people.

Methods: Contact tracing data of all the laboratory-confirmed COVID-19 cases in Hong Kong from February 16, 2020 to April 30, 2021 were used to form the infection clusters for estimating the time-varying dispersion parameter (k), a measure of superspreading potential. Generalized additive models with identity link function were used to examine the association between negative-log k (larger means higher superspreading potential) and the environmental covariates, adjusted with mobility metrics that account for the effect of social distancing measures.

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Article Synopsis
  • A study in Hong Kong assessed the impact of taxing sugar-sweetened beverages (SSBs) on obesity and type 2 diabetes (T2DM) prevalence through a survey and simulation analysis.
  • The survey involved 1,000 adults who indicated their willingness to pay under different tax scenarios (5%, 10%, 40%, and 50%), leading to projections about SSB purchases and related health outcomes over a decade.
  • Results showed that higher taxation rates led to significant decreases in SSB purchases, with a notable reduction in obesity and T2DM cases, highlighting the potential of SSB taxes for improving public health in Asian contexts.
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Article Synopsis
  • * It utilized real-world data from Hong Kong’s health authorities, comparing outcomes between patients treated with nirmatrelvir-ritonavir and those who were not treated with this or another antiviral, molnupiravir.
  • * The analysis included over 50,000 patients and aimed to assess post-acute death and various health issues (like heart disease and anxiety) starting 21 days after a positive COVID-19 test.
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Article Synopsis
  • Vector-borne diseases like dengue fever are spreading quickly due to changing climates, requiring further study on their transmission in South and Southeast Asia.
  • The study analyzed dengue incidence and climate data from Singapore, Sri Lanka, Malaysia, and Thailand between 2012-2020, assessing the impact of temperature and rainfall on disease transmission.
  • Projections indicated that dengue transmission potential varies by location and is most affected by middle-to-high greenhouse gas emission scenarios, highlighting the need for interventions to mitigate global warming and its impact on dengue outbreaks.
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Introduction: Pre-eclampsia (PE) affects about 5% of Chinese pregnant women and is a major cause of maternal and perinatal morbidity and mortality. The first trimester screening model developed by the Fetal Medicine Foundation, which uses the Bayes theorem to combine maternal characteristics and medical history together with measurements of biomarkers, has been proven to be effective and has superior screening performance to that of the traditional risk factor-based approach for the prediction of PE. Prophylactic use of low-dose aspirin in women at risk for PE has resulted in a lower incidence of preterm-PE.

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Objectives: To compare metabolic dysfunction-associated profiles between patients with diabetes who developed different obesity-related site-specific cancers and those who remained free of cancer during follow-up.

Design: Retrospective cohort study.

Setting: Public general outpatient clinics in Hong Kong.

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Background: There are few studies on the health effects of long-term exposure to neighborhood greenness in a longitudinal setting, especially in Asian countries with high population densities.

Objectives: This study investigates the association between long-term exposure to neighborhood greenness and hypertension among adults in Taiwan.

Methods: We selected 125,537 participants ( of age) without hypertension from Taiwan who had joined the standard medical examination program between 2001 and 2016.

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Article Synopsis
  • A cross-sectional study conducted in Hong Kong from 2021-23 assessed oral HPV infections in 2323 HPV vaccine-naïve adults aged 18-75 using oral rinse samples and a questionnaire on sociodemographics and sexual behavior.
  • The overall prevalence of oral HPV was 1.5%, with higher rates observed in older age groups, particularly women aged 45-54 (2.7%) and men over 64 years (4.1%), while HPV52 was identified as the most common genotype.
  • The study indicated that while having more sexual partners might increase risk, having a higher educational level offered a protective effect, highlighting the need for strategies to prevent oral HPV infections and related cancers.
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We tested seroprevalence of open reading frame 8 antigens to infer the number of unrecognized SARS-CoV-2 Omicron infections in Hong Kong during 2022. We estimate 33.6% of the population was infected, 72.

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Article Synopsis
  • Identifying individuals at high risk for osteoporosis is crucial for preventing fractures, but current screening tools lack specificity.
  • A new machine learning-based Preclinical Osteoporosis Screening Tool (POST) was developed specifically for the Hong Kong Chinese population, utilizing data from participants aged 45 and older.
  • The POST successfully identified 7 key risk factors and demonstrated a high performance with an AUC of 0.86, offering an accessible and effective method for osteoporosis risk assessment.
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