Kun-Sun Chan
Biographic Data
| ID | 100634 |
|---|---|
| NAME | Kun-Sun Chan |
| GIVEN NAMES | Kun-Sun |
| FAMILY NAME | Chan |
| SIGNATURE | CHAN K |
| AFFILIATIONS | Johns Hopkins University |
| ORCID | 0000-0003-2639-4186 |
| VERIFIED | Yes |
| TOTAL WORKS | 25 |
| TOTAL CITATIONS | 59 |
| AUTHOR COUNT | 25 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1998 |
| LATEST PUBLICATION YEAR | 2021 |
| H-INDEX | 3 |
Development of the Experiences of Sex Work Stigma Scale Using Item Response Theory: Implications for Research on the Social Determinants of HIV
While HIV stigma has received significant attention, limited work has been conducted on the measurement of intersecting stigmas. We developed the Experiences of Sex Work Stigma (ESWS) scale in the Dominican Republic (DR) and Tanzania. We conducted in-depth interviews with 20 female sex workers (FSW) per country to identify scale domains followed by cognitive debriefing interviews to assess content validity. Items were administered in a survey to …
Health Care Disparities in Race-Ethnic Minority Communities and Populations: Does the Availability of Health Care Providers Play a Role
No Man is an Island: The Impact of Neighborhood Disadvantage on Mortality
This study's purpose is to determine if neighborhood disadvantage, air quality, economic distress, and violent crime are associated with mortality among term life insurance policyholders, after adjusting for individual demographics, health, and socioeconomic characteristics. We used a sample of approximately 38,000 term life policyholders, from a large national life insurance company, who purchased a policy from 2002 to 2010. We linked this data …
Measuring Physical Capacity: An Assessment of a Composite Measure Using Self-Report and Performance-Based Items
Self-report and performance measures have different strengths on the physical capacity spectrum. IRT provides a means of combining these different measurement approaches for analyses of physical capacity across a broad range of functioning in later life
Harmonizing Measures of Cognitive Performance Across International Surveys of Aging Using Item Response Theory
IRT offers a feasible strategy for harmonizing cognitive performance measures across other surveys and for other multi-item constructs of interest in studies of aging. Practical implications depend on sample distribution and the difficulty mix of in-common and survey-specific items
Variations in Asian Americans: How Neighborhood Concordance Is Associated With Health Care Access and Utilization
We examined associations of different levels of same-ethnicity neighborhood concordance with health care access and utilization among all Asian American, Chinese, Filipino, and Vietnamese adults (aged 18–64 years) using the 2005, 2007, and 2009 California Health Interview Survey and the 2010 US Census. Although associations varied by subgroup, Asian Americans in highly concordant neighborhoods were more likely to lack a usual source of care but d…
Effect of Acculturation on Variations in Having a Usual Source of Care Among Asian Americans and Non-Hispanic Whites in California
Objectives. We examined variations in having a usual source of care (USC) among non-Hispanic White and Asian American adults in California. Methods. Data were from the 2005 and 2009 California Health Interview Survey. Using a modified Anderson model, we used multiple logistic regression to compare odds of having a USC between non-Hispanic White (n = 38 554) and Asian American adults (n = 7566) and to examine associations with acculturation factor…
An Index for Measuring Overuse of Health Care Resources With Medicare Claims
BACKGROUND: Overuse can be defined as use of a service when the risk of harm exceeds its likely benefit. Yet, there has been little work with composite measures of overuse. OBJECTIVE: Our goal was to create a composite measure of overuse with claims data. DESIGN: Observational study using 5% of Medicare claims from 2008. SETTING: All inpatient and outpatient settings of care, excluding nursing homes. PARTICIPANTS: Older Americans receiving health…
An Introduction to Item Response Theory for Patient-Reported Outcome Measurement
Outcomes of synergetic peer assessment: First-year experience
Active participation in learning activities and reviewing assessment activity can facilitate learners engaged in these processes. This case study reports student experiences of the process of peer assessment with teacher guidance in a group project for a first-year nursing course with 153 students. Twenty groups of students were assigned roles in exploring one of the two scenarios: one involved analysing diabetes mellitus and the other considered…
Community Characteristics and Mortality: The Relative Strength of Association of Different Community Characteristics
Objectives. We compared the strength of association between average 5-year county-level mortality rates and area-level measures, including air quality, sociodemographic characteristics, violence, and economic distress. Methods. We obtained mortality data from the National Vital Statistics System and linked it to socioeconomic and demographic data from the Census Bureau, air quality data, violent crime statistics, and loan delinquency data. We mod…
Factors Associated With Having a Usual Source of Care in an Ethnically Diverse Sample of Asian American Adults
BACKGROUND: Despite significant population increases, how Asian Americans ethnic subgroups vary in having a usual source of care (USC) is poorly understood. OBJECTIVES: To examine how having a USC varies among Asian American ethnic subgroups (Chinese, Filipinos, Japanese, Koreans, Vietnamese, and South Asians), and the potential factors influencing variation in having a USC. RESEARCH DESIGN: Data were from 2005 and 2009 California Health Intervie…
Identifying Possible Indicators of Systematic Overuse of Health Care Procedures With Claims Data
BACKGROUND: Health care quality is frequently described with measures representing the overall performance of a health care system. Despite the growing attention to overuse of health care resources, there is little experience with aggregate measures of overuse. OBJECTIVE: To identify a set of possible indicators of overuse that can be operationalized with claims data and to describe variation in these indicators across the hospital referral regio…
Residential segregation, geographic proximity and type of services used: Evidence for racial/ethnic disparities in mental health
Residential Segregation and Disparities in Health Care Services Utilization
Using data from the 2006 Medical Expenditure Panel Survey and the 2000 Census, the authors explored whether race/ethnic disparities in health care use were associated with residential segregation. They used five measures of health care use: office-based physician visits, outpatient department physician visits, visits to nurses and physician’s assistants, visits to other health professionals, and having a usual source of care. For each individual,…
Do Diabetic Patients Living in Racially Segregated Neighborhoods Experience Different Access and Quality of Care
BACKGROUND: Place of residence, particularly residential segregation, has been implicated in health and health care disparities. However, prior studies have not focused on care for diabetes, a prevalent condition for minority populations. OBJECTIVE: To examine the association of residential segregation with a range of access and quality of care outcomes among black and Hispanics with diabetes using a nationally representative US sample. RESEARCH …
Measurement Equivalence in ADL and Iadl Difficulty Across International Surveys of Aging: Findings From the HRS, SHARE, and Elsa
Testing and adjusting for DIF is one means of minimizing measurement error in cross-national survey comparisons. IRT methods were used to evaluate potential measurement bias in disability comparisons across three international surveys of aging. The analysis also suggested DIF was mitigated for scales including both ADL and IADL and that summary indexes (counts of limitations) likely underestimate mean disability in these international populations
Development and validation of a composite score based on clinically meaningful events for the opioid-related symptom distress scale
Does patient–provider gender concordance affect mental health care received by primary care patients with major depression
The PedsQL: Reliability and Validity of the Short-Form Generic Core Scales and Asthma Module
OBJECTIVE: We sought to assess the reliability and validity of the PedsQL 4.0 SF15, a shortened version of the 23-item PedsQL 4.0 Generic Core Scales, which is a pediatric health-related quality of life (HRQoL) instrument, and the PedsQL 3.0 SF22 Asthma Module, a short-form of the PedsQL 3.0 Asthma Module. METHODS: The PedsQL 4.0 SF15 and the PedsQL 3.0 SF22 Asthma Module were administered by telephone to 125 adolescents (aged 12-18) and 338 pare…
Mental Health Status and Use of General Medical Services for Persons With Human Immunodeficiency Virus
BACKGROUND: Serious medical illness often is accompanied by psychological distress. Individuals experiencing mental disorders or symptoms have higher rates of morbidity and mortality, worse social functioning, and use of general medical services. OBJECTIVES: We sought to examine the association between mental health and use of general medical services for persons in care for HIV. DESIGN AND PARTICIPANTS: We used longitudinal data from the HIV Cos…
The Interview Mode Effect on the Center for Epidemiological Studies Depression (CES-D) Scale: An Item Response Theory Analysis
BACKGROUND: Evidence of a mode effect has raised concerns about the comparability and validity of self- versus interviewer-administered versions of the Center for Epidemiological Studies Depression (CES-D) scale. Response anonymity has been proposed to explain this effect. However, the factors that contribute to this mode effect are not well understood. We used item response theory (IRT) to examine the nature of the CES-D mode effect. METHODS: A …
Imputing Physical Health Status Scores Missing Owing to Mortality: Results of a Simulation Comparing Multiple Techniques
BACKGROUND: Having missing data complicates the statistical analysis of health-related quality-of-life (HRQOL) data and, depending on the extent and nature of missing data, can introduce significant bias in treatment comparisons. OBJECTIVE: We evaluated the bias associated with 4 different imputation methods for estimating physical health status (PHS) scores missing as a result of mortality. METHODS: A simulation study was conducted in which we s…
The Social Role of Catholics in Hong Kong Society
Hong Kong is experiencing significant social and political changes. The Catholic Church in Hong Kong is reorienting its social role, particularly as concerns its prophetic role in society and its relationship with the Socialist Chinese government, which has just resumed sovereignty after over 150 years of British rule. The Catholic Church has been an important contributor to the provision of education and social services, but it was much less inv…
Discriminant validity of the Medical Outcomes Study cognitive function scale in HIV disease patients
Residential segregation, geographic proximity and type of services used: Evidence for racial/ethnic disparities in mental health
Measurement Equivalence in ADL and Iadl Difficulty Across International Surveys of Aging: Findings From the HRS, SHARE, and Elsa
Testing and adjusting for DIF is one means of minimizing measurement error in cross-national survey comparisons. IRT methods were used to evaluate potential measurement bias in disability comparisons across three international surveys of aging. The analysis also suggested DIF was mitigated for scales including both ADL and IADL and that summary indexes (counts of limitations) likely underestimate mean disability in these international populations
Effect of Acculturation on Variations in Having a Usual Source of Care Among Asian Americans and Non-Hispanic Whites in California
Objectives. We examined variations in having a usual source of care (USC) among non-Hispanic White and Asian American adults in California. Methods. Data were from the 2005 and 2009 California Health Interview Survey. Using a modified Anderson model, we used multiple logistic regression to compare odds of having a USC between non-Hispanic White (n = 38 554) and Asian American adults (n = 7566) and to examine associations with acculturation factor…
Health Care Disparities in Race-Ethnic Minority Communities and Populations: Does the Availability of Health Care Providers Play a Role
Variations in Asian Americans: How Neighborhood Concordance Is Associated With Health Care Access and Utilization
We examined associations of different levels of same-ethnicity neighborhood concordance with health care access and utilization among all Asian American, Chinese, Filipino, and Vietnamese adults (aged 18–64 years) using the 2005, 2007, and 2009 California Health Interview Survey and the 2010 US Census. Although associations varied by subgroup, Asian Americans in highly concordant neighborhoods were more likely to lack a usual source of care but d…
Community Characteristics and Mortality: The Relative Strength of Association of Different Community Characteristics
Objectives. We compared the strength of association between average 5-year county-level mortality rates and area-level measures, including air quality, sociodemographic characteristics, violence, and economic distress. Methods. We obtained mortality data from the National Vital Statistics System and linked it to socioeconomic and demographic data from the Census Bureau, air quality data, violent crime statistics, and loan delinquency data. We mod…
Measuring Physical Capacity: An Assessment of a Composite Measure Using Self-Report and Performance-Based Items
Self-report and performance measures have different strengths on the physical capacity spectrum. IRT provides a means of combining these different measurement approaches for analyses of physical capacity across a broad range of functioning in later life
The Social Role of Catholics in Hong Kong Society
Hong Kong is experiencing significant social and political changes. The Catholic Church in Hong Kong is reorienting its social role, particularly as concerns its prophetic role in society and its relationship with the Socialist Chinese government, which has just resumed sovereignty after over 150 years of British rule. The Catholic Church has been an important contributor to the provision of education and social services, but it was much less inv…
Discriminant validity of the Medical Outcomes Study cognitive function scale in HIV disease patients
Imputing Physical Health Status Scores Missing Owing to Mortality: Results of a Simulation Comparing Multiple Techniques
BACKGROUND: Having missing data complicates the statistical analysis of health-related quality-of-life (HRQOL) data and, depending on the extent and nature of missing data, can introduce significant bias in treatment comparisons. OBJECTIVE: We evaluated the bias associated with 4 different imputation methods for estimating physical health status (PHS) scores missing as a result of mortality. METHODS: A simulation study was conducted in which we s…
The Interview Mode Effect on the Center for Epidemiological Studies Depression (CES-D) Scale: An Item Response Theory Analysis
BACKGROUND: Evidence of a mode effect has raised concerns about the comparability and validity of self- versus interviewer-administered versions of the Center for Epidemiological Studies Depression (CES-D) scale. Response anonymity has been proposed to explain this effect. However, the factors that contribute to this mode effect are not well understood. We used item response theory (IRT) to examine the nature of the CES-D mode effect. METHODS: A …
The PedsQL: Reliability and Validity of the Short-Form Generic Core Scales and Asthma Module
OBJECTIVE: We sought to assess the reliability and validity of the PedsQL 4.0 SF15, a shortened version of the 23-item PedsQL 4.0 Generic Core Scales, which is a pediatric health-related quality of life (HRQoL) instrument, and the PedsQL 3.0 SF22 Asthma Module, a short-form of the PedsQL 3.0 Asthma Module. METHODS: The PedsQL 4.0 SF15 and the PedsQL 3.0 SF22 Asthma Module were administered by telephone to 125 adolescents (aged 12-18) and 338 pare…
Mental Health Status and Use of General Medical Services for Persons With Human Immunodeficiency Virus
BACKGROUND: Serious medical illness often is accompanied by psychological distress. Individuals experiencing mental disorders or symptoms have higher rates of morbidity and mortality, worse social functioning, and use of general medical services. OBJECTIVES: We sought to examine the association between mental health and use of general medical services for persons in care for HIV. DESIGN AND PARTICIPANTS: We used longitudinal data from the HIV Cos…
Does patient–provider gender concordance affect mental health care received by primary care patients with major depression
Development and validation of a composite score based on clinically meaningful events for the opioid-related symptom distress scale
Measurement Equivalence in ADL and Iadl Difficulty Across International Surveys of Aging: Findings From the HRS, SHARE, and Elsa
Testing and adjusting for DIF is one means of minimizing measurement error in cross-national survey comparisons. IRT methods were used to evaluate potential measurement bias in disability comparisons across three international surveys of aging. The analysis also suggested DIF was mitigated for scales including both ADL and IADL and that summary indexes (counts of limitations) likely underestimate mean disability in these international populations
Residential Segregation and Disparities in Health Care Services Utilization
Using data from the 2006 Medical Expenditure Panel Survey and the 2000 Census, the authors explored whether race/ethnic disparities in health care use were associated with residential segregation. They used five measures of health care use: office-based physician visits, outpatient department physician visits, visits to nurses and physician’s assistants, visits to other health professionals, and having a usual source of care. For each individual,…
Do Diabetic Patients Living in Racially Segregated Neighborhoods Experience Different Access and Quality of Care
BACKGROUND: Place of residence, particularly residential segregation, has been implicated in health and health care disparities. However, prior studies have not focused on care for diabetes, a prevalent condition for minority populations. OBJECTIVE: To examine the association of residential segregation with a range of access and quality of care outcomes among black and Hispanics with diabetes using a nationally representative US sample. RESEARCH …
Residential segregation, geographic proximity and type of services used: Evidence for racial/ethnic disparities in mental health
An Introduction to Item Response Theory for Patient-Reported Outcome Measurement
Outcomes of synergetic peer assessment: First-year experience
Active participation in learning activities and reviewing assessment activity can facilitate learners engaged in these processes. This case study reports student experiences of the process of peer assessment with teacher guidance in a group project for a first-year nursing course with 153 students. Twenty groups of students were assigned roles in exploring one of the two scenarios: one involved analysing diabetes mellitus and the other considered…
Community Characteristics and Mortality: The Relative Strength of Association of Different Community Characteristics
Objectives. We compared the strength of association between average 5-year county-level mortality rates and area-level measures, including air quality, sociodemographic characteristics, violence, and economic distress. Methods. We obtained mortality data from the National Vital Statistics System and linked it to socioeconomic and demographic data from the Census Bureau, air quality data, violent crime statistics, and loan delinquency data. We mod…
Factors Associated With Having a Usual Source of Care in an Ethnically Diverse Sample of Asian American Adults
BACKGROUND: Despite significant population increases, how Asian Americans ethnic subgroups vary in having a usual source of care (USC) is poorly understood. OBJECTIVES: To examine how having a USC varies among Asian American ethnic subgroups (Chinese, Filipinos, Japanese, Koreans, Vietnamese, and South Asians), and the potential factors influencing variation in having a USC. RESEARCH DESIGN: Data were from 2005 and 2009 California Health Intervie…
Identifying Possible Indicators of Systematic Overuse of Health Care Procedures With Claims Data
BACKGROUND: Health care quality is frequently described with measures representing the overall performance of a health care system. Despite the growing attention to overuse of health care resources, there is little experience with aggregate measures of overuse. OBJECTIVE: To identify a set of possible indicators of overuse that can be operationalized with claims data and to describe variation in these indicators across the hospital referral regio…
Harmonizing Measures of Cognitive Performance Across International Surveys of Aging Using Item Response Theory
IRT offers a feasible strategy for harmonizing cognitive performance measures across other surveys and for other multi-item constructs of interest in studies of aging. Practical implications depend on sample distribution and the difficulty mix of in-common and survey-specific items
Variations in Asian Americans: How Neighborhood Concordance Is Associated With Health Care Access and Utilization
We examined associations of different levels of same-ethnicity neighborhood concordance with health care access and utilization among all Asian American, Chinese, Filipino, and Vietnamese adults (aged 18–64 years) using the 2005, 2007, and 2009 California Health Interview Survey and the 2010 US Census. Although associations varied by subgroup, Asian Americans in highly concordant neighborhoods were more likely to lack a usual source of care but d…
Effect of Acculturation on Variations in Having a Usual Source of Care Among Asian Americans and Non-Hispanic Whites in California
Objectives. We examined variations in having a usual source of care (USC) among non-Hispanic White and Asian American adults in California. Methods. Data were from the 2005 and 2009 California Health Interview Survey. Using a modified Anderson model, we used multiple logistic regression to compare odds of having a USC between non-Hispanic White (n = 38 554) and Asian American adults (n = 7566) and to examine associations with acculturation factor…
An Index for Measuring Overuse of Health Care Resources With Medicare Claims
BACKGROUND: Overuse can be defined as use of a service when the risk of harm exceeds its likely benefit. Yet, there has been little work with composite measures of overuse. OBJECTIVE: Our goal was to create a composite measure of overuse with claims data. DESIGN: Observational study using 5% of Medicare claims from 2008. SETTING: All inpatient and outpatient settings of care, excluding nursing homes. PARTICIPANTS: Older Americans receiving health…
Measuring Physical Capacity: An Assessment of a Composite Measure Using Self-Report and Performance-Based Items
Self-report and performance measures have different strengths on the physical capacity spectrum. IRT provides a means of combining these different measurement approaches for analyses of physical capacity across a broad range of functioning in later life
No Man is an Island: The Impact of Neighborhood Disadvantage on Mortality
This study's purpose is to determine if neighborhood disadvantage, air quality, economic distress, and violent crime are associated with mortality among term life insurance policyholders, after adjusting for individual demographics, health, and socioeconomic characteristics. We used a sample of approximately 38,000 term life policyholders, from a large national life insurance company, who purchased a policy from 2002 to 2010. We linked this data …
Health Care Disparities in Race-Ethnic Minority Communities and Populations: Does the Availability of Health Care Providers Play a Role
Development of the Experiences of Sex Work Stigma Scale Using Item Response Theory: Implications for Research on the Social Determinants of HIV
While HIV stigma has received significant attention, limited work has been conducted on the measurement of intersecting stigmas. We developed the Experiences of Sex Work Stigma (ESWS) scale in the Dominican Republic (DR) and Tanzania. We conducted in-depth interviews with 20 female sex workers (FSW) per country to identify scale domains followed by cognitive debriefing interviews to assess content validity. Items were administered in a survey to …
Medicine (23 works) · Gerontology (11 works) · Psychology (11 works) · Health care (9 works) · Health disparities and outcomes (9 works) · Demography (8 works) · Environmental health (8 works) · Gerontology (8 works) · Political science (8 works) · Psychiatry (8 works)