Crystal Ying Chan

Dr. Crystal Ying Chan

orcid

Research Focus & Metrics

Academic Career Length

7Years (2020-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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5 October 2022 in The Lancet Regional Health - Western Pacific
Verified
Journal Article
Open access
AWAbraham Ka-Chung Wai
Abraham Ka-Chung Wai
CCCrystal Ying Chan
Crystal Ying Chan
ACAnnie Wai-Ling Cheung
Annie Wai-Ling Cheung
KWKailu Wang
Kailu Wang
SCSunny Ching-Long Chan
Sunny Ching-Long Chan
Eliza WongEliza Wong
Eliza Wong
Real-world data is currently limited on the association between oral antiviral therapy and healthcare system burden in patients with mild-to-moderate COVID-19. This study aims to evaluate the clinical and cost effectiveness of Molnupiravir and Nirmatrelvir-ritonavir use in reducing mortality in this population. This is a retrospective cohort study involving 54,355 COVID-19 patients during February 22–March 31,2022 in Hong Kong. Inverse probability of treatment weighting (IPTW) was used to adjust patient characteristics. Our exposure of interest was Molnupiravir/Nirmatrelvir-Ritonavir prescription, with all-cause mortality as the primary outcome. IPTW-adjusted multivariate regressions were used to estimate treatment impact on clinic re-attendance and unplanned admissions. Finally, attributed cost and incremental cost-effectiveness ratios (ICER) were estimated. In the outpatient cohort (N = 33,217, 61.1%), 16.1% used Molnupiravir and 13.4% used Nirmatrelvir-Ritonavir, while in the inpatient cohort (N = 21,138, 38.9%), 3.8% used Molnupiravir and 1.3% used Nirmatrelvir-Ritonavir. IPTW-adjusted Cox model estimated that Molnupiravir (hazard ratio (HR)(95%CI)=0.31 (0.24-0.40), P< 0.0001) and Nirmatrelvir-Ritonavir (HR=0.10 (95%CI 0.05-0.21), P< 0.0001) were significantly associated with a reduced mortality hazard. In the outpatient cohort, both antiviral prescriptions were associated with reduced odds for unplanned hospital admissions (Molnupiravir: odds ratio (OR) =0.72 (0.52-0.98), P=0.039; Nirmatrelvir-Ritonavir: OR=0.37 (0.23-0.60), P<0.0001). Among hospitalised patients, both antiviral prescriptions were associated with significant reductions in the odds ratios for 28-days readmission (Molnupiravir: OR=0.71 (0.52-0.97), P=0.031; Nirmatrelvir-Ritonavir: OR=0.47 (0.24-0.93), P=0.030). ICERs for death averted for Molnupiravir stood at USD493,345.09 in outpatient settings and USD2,629.08 in inpatient settings. In outpatient settings, Nirmatrelvir-ritonavir cost USD331,105.27 to avert one death, but saved USD5,502.53 to avert one death in comparison with standard care. In high-risk patients in Hong Kong with mild-to-moderate COVID-19, Molnupiravir and Nirmatrelvir-Ritonavir prescriptions were associated with reduced all-cause mortality and significant cost savings. Centre for Health Systems & Policy Research is funded by The Tung's Foundation; and The Laboratory of Data Discovery for Health Limited(D24H) is funded the AIR@InnoHK platform administered by the Innovation and Technology Commission of Hong Kong. Funders did not have any role in study design, data collection, data analysis, interpretation and writing of this manuscript.

Eliza WongEliza Wong
Eliza Wong
JLJennifer Mengwei Liao
Jennifer Mengwei Liao
CEChristopher Etherton-Beer
Christopher Etherton-Beer
LBLoretta Baldassar
Loretta Baldassar
GCGary Cheung
Gary Cheung
EYEK Yeoh
EK Yeoh
We explore the intergenerational pattern of resource transfer and possible associated factors. A scoping review was conducted of quantitative, peer-reviewed, English-language studies related to intergenerational transfer or interaction. We searched AgeLine, PsycINFO, Social Work Abstracts, and Sociological Abstracts for articles published between Jane 2008 and December 2018. Seventy-five studies from 25 countries met the inclusion criteria. The scoping review categorised resource transfers into three types: financial, instrumental, and emotional support. Using an intergenerational solidarity framework, factors associated with intergenerational transfer were placed in four categories: (1) demographic factors (e.g., age, gender, marital status, education, and ethno-cultural background); (2) needs and opportunities factors, including health, financial resources, and employment status; (3) family structures, namely, family composition, family relationship, and earlier family events; and (4) cultural-contextual structures, including state policies and social norms. Those factors were connected to the direction of resource transfer between generations. Downward transfers from senior to junior generations occur more frequently than upward transfers in many developed countries. Women dominate instrumental transfers, perhaps influenced by traditional gender roles. Overall, the pattern of resource transfer between generations is shown, and the impact of social norms and social policy on intergenerational transfers is highlighted. Policymakers should recognise the complicated interplay of each factor with different cultural contexts. The findings could inform policies that strengthen intergenerational solidarity and support.

8 June 2023 in Nutrients
Verified
Journal Article
Open access
PDF file
WCWai Ki Chan
Wai Ki Chan
CCCrystal Ying Chan
Crystal Ying Chan
BHBecky Pek-kei Hoi
Becky Pek-kei Hoi
JCJoyce Ho-Yi Chan
Joyce Ho-Yi Chan
SLSin Li
Sin Li
KLKenneth Lo
Kenneth Lo
Individuals with lower socioeconomic status are more vulnerable in securing good nutritional quality. It was also found that people who had received a lower education level had greater difficulty in completing the conventional dietary assessment such as a food frequency questionnaire (FFQ). Previous studies have demonstrated the validity of a short FFQ in Hong Kong’s pregnant women, but its validity among a wider community was still unknown. For the present study, we aimed to validate a short FFQ among disadvantaged communities in Hong Kong. Amongst 103 individuals participating in a dietary intervention programme, their dietary data were collected by FFQs and three-day dietary records. Relative validity was assessed by correlation analysis, cross-tabulation, one-sample t-test, and linear regression. In general, water and total energy intake had significant correlations (0.77 for crude water intake and 0.87 for crude total energy intake) between values reported by FFQ and dietary records, good agreement (both with over 50% of observations falling into the same quartile), and insignificant differences between assessment methods reported by one-sample t-test and linear regression. Meanwhile, several nutrients had good agreement in terms of the values reported by FFQ and dietary records, such as energy from total fat, carbohydrates, total fat, cholesterol, phosphorus, and potassium. The results of this study demonstrated that the short version FFQ could be a convenient assessment tool of multiple dietary behaviors, especially in total energy and water intakes.

21 November 2022 in BMJ Open
Verified
Journal Article
Open access
PDF file
CCCrystal Ying Chan
Crystal Ying Chan
PCPatsy Y K Chau
Patsy Y K Chau
EYEng-Kiong Yeoh
Eng-Kiong Yeoh
Eliza WongEliza Wong
Eliza Wong
Objectives To evaluate the impact of providing additional dementia caregiver support services on caregiver burden. Design Interrupted time-series analysis using territory-wide panel data. Settings All public-funded district elderly community centres in Hong Kong (HK). Participants Primary caregivers for older adults (age over 65 years) living with dementia assessed through International Residential Assessment in HK between 1 October 2004 and 31 September 2016. Paid caregivers were excluded. Interventions In April 2014, US$280 million was allocated to provide additional psychological support, education and respite care for dementia caregivers in HK. Main outcome measures Caregiver burden was measured by two age-standardised rates: (1) caregivers in emotional distress; and (2) caregivers with long care time in a week (more than 20 hours a week). We fitted the two time-series into Autoregressive Integrated Moving Average models to evaluate intervention impacts, with follow-up analyses to consider a 6-month transition period of policy implementation. Segmented linear regressions and Holt-Winter exponential smoothening models were used as sensitivity analyses. Results 36 689 dementia caregivers were included in this study, of which 14.4% caregivers were distress and 31.9% were long-hours caregivers after the policy intervention in April 2014. Providing additional caregiver service significantly reduced standardised rates of caregivers in distress (β (95% CI)=−3.93 (−7.85 to −0.01), p<0.05), but the effect was not sustained (p=0.183). There was no significant impact on the level of age-standardised rates of caregiver with long care time (β (95 CI)=−4.25 (−9.61 to 1.10), p=0.120). Also, there was no significant delay of intervention impacts. Conclusion Our study finds that strengthening caregiver services provision could reduce distress rates among primary caregivers for older adults living with dementia. Expanding community services for caregiver could be a solution to the escalating burden of informal care for people living with dementia.

2 December 2025 in BMC Public Health
Verified
Journal Article
Open access
PDF file
CCCrystal Ying Chan
Crystal Ying Chan
HKHarley Hiu-Yung Kwok
Harley Hiu-Yung Kwok
Wai Tong ChienWai Tong Chien
Wai Tong Chien
FIFish Pui-Yu Ip
Fish Pui-Yu Ip
DVDanna Camille Vargas
Danna Camille Vargas
Eliza WongEliza Wong
Eliza Wong
Background: Migrant workers face additional stress from language and cultural barriers in host countries. Educational programs focus on supporting acculturation of migrant workers are often believed to help stress-relief by providing knowledge for their language learning, cultural understanding, and inclusive practises, but no conclusion has been made on the effectiveness. This review aims to address this gap by examining the impact of acculturation programmes in managing psychological distress among migrant workers, with anxiety and depression as primary outcomes, and stress as secondary outcome. Methods: We searched six bibliographic databases (Embase, Medline, CINAHL Complete, PsycInfo, SocINDEX, and Cochrane Library) from inception to 12 September 2024 using keywords “migrant workers AND education AND (stress OR anxiety OR depress)” and grey literatures. Results: Eleven articles were critically appraised as identified from 4795 searched titles. Included studies were primarily conducted in the United States, involved predominately blue-collar workers/ health care workers, and females. Seven types of interventions were identified. Specifically, positive impacts on stress levels were observed following lay health educators’ intervention (MD: -4.03, p < 0.01 in Latina migrants), peer groups, and spiritual retreat courses demonstrated significant evidence of reducing stress. Peer groups resulted in a significant improvement in perceived stress levels among resettled working refugees (MD: -5.00, p < 0.0001). Similarly, spiritual retreat courses significantly improved perceived stress levels in Nigerian women workers, with a mean difference of -4.05 ( p < 0.01). However, improvement in anxiety after life skills trainings was insignificant. Overall, such programs can effectively address stress and depression, ultimately improving the overall well-being of migrant workers in host countries. Conclusions: Acculturation programmes covering life skills and work skills are common approaches in supporting migrant workers’ mental health. Overall, the findings suggest that migrant-local support groups, lay health educators’ interventions, peer groups, and spiritual retreat courses, can effectively address stress and depression among migrant workers. However, heterogeneity exists between studies. Acculturation programmes constitute feasible solutions to address the global mental health crisis. Future research should be done to investigate acculturative educational programmes impact in a larger population. Registration: This review was registered on PROSPERO (CRD42021292998).

15 October 2025 in Environmental Research
Verified
Journal Article
Closed access
YCYujing Chen
Yujing Chen
FAFarida S. Akhtari
Farida S. Akhtari
YHYixuan He
Yixuan He
LYLihang Yu
Lihang Yu
VNVy Kim Nguyen
Vy Kim Nguyen
MCMing Kei Chung
Ming Kei Chung