Category: Statistics

Retina. 2026 Feb 3. doi: 10.1097/IAE.0000000000004800. Online ahead of print.

ABSTRACT

PURPOSE: To evaluate the relationship between sleep disorders, including insomnia and obstructive sleep apnea (OSA), personal chronotype, and age-related macular degeneration (AMD).

METHODS: We systematically reviewed articles in PubMed, EMBASE, and Web of Science that provided information on AMD and sleep disorders, whether qualitative or quantitative. We systematically screened the abstracts of potentially eligible studies and subsequently assessed the full-text reports of those deemed relevant in detail. The study adhered to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines.

RESULTS: Twenty-two studies were included in our final review. OSA was associated with a higher risk of AMD, based on seven studies (HR 1.43; 95% CI 1.14-1.79 p < 0.001; I2 = 96%). The analysis showed a statistically significant association between the morning person chronotype and an increased odds of AMD (OR 1.19; 95% CI 1.10-1.30; p < 0.001; I2 = 0%). We found little to no association between sleep duration and insomnia.

CONCLUSION: Our meta-analyses, although based on a limited number of studies, indicate that sleep disorders, particularly OSA, are associated with increased odds of developing AMD. However, further research is needed to understand how sleep duration affects disease progression and to determine the benefits of treating sleep disorders for AMD.

PMID:41687120 | DOI:10.1097/IAE.0000000000004800

Acta Med Port. 2026 Feb 2;39(2):114-124. doi: 10.20344/amp.23502. Epub 2026 Feb 2.

ABSTRACT

INTRODUCTION: Red blood cell (RBC) transfusions are frequent in cardiac surgery and are associated with higher morbidity, mortality, prolonged hospitalization, and increased healthcare costs. Several patient- and procedure-related factors have been identified as transfusion predictors. Studying these predictors in specific populations allows more accurate risk stratification and tailored clinical decision-making. RBC transfusions represent a significant economic burden for healthcare systems due to increased resource utilization and hospital costs overall. The aim of this study was to identify independent risk factors of RBC transfusion, evaluate its economic impact, and estimate potential cost savings from eliminating preoperative anemia.

METHODS: We conducted a retrospective cohort study at a tertiary hospital in Portugal, including 661 adults who underwent elective cardiac surgery between April 2020 and April 2021. The primary outcome was the need for at least one RBC transfusion during hospitalization. Secondary outcomes included 30-day mortality, infection, acute kidney injury, prolonged mechanical ventilation, intensive care unit stay, hospital length of stay (LOS), and hospital costs. Independent risk factors were identified using multivariable logistic regression. An economic analysis compared costs between transfused and non-transfused patients. To estimate potential cost reductions, a simulation model was developed assuming the elimination of preoperative anemia and applying the observed transfusion patterns of non-anemic patients to the entire cohort.

RESULTS: Red blood cell transfusion occurred in 41.3% of patients. The identified predictors were preoperative anemia (OR 3.67; 2.00 – 6.74), female sex (OR 2.06; 1.22 – 3.48), higher EuroSCORE II (OR 1.15; 1.03 – 1.29), longer cardiopulmonary bypass time (OR 1.01; 1.00 – 1.02) and lower intraoperative nadir hemoglobin (OR 0.48; 0.40 – 0.58), after adjusting for postoperative hemorrhage. Transfused patients had longer hospital stays (median 10 vs 8 days) and higher costs (median increase of €2264.44). After adjustment for infection and prolonged ventilation, transfusion was no longer independently associated with LOS. Eliminating preoperative anemia could prevent 47 transfusions, reduce 94 hospital days, and save €106 429 over 13 months overall.

CONCLUSION: Red blood cell transfusion was associated with longer hospital stays, likely due to higher infection rates and prolonged mechanical ventilation. Correcting preoperative anemia could potentially reduce transfusion rates and related hospital costs in cardiac surgery.

PMID:41687115 | DOI:10.20344/amp.23502

Acta Med Port. 2026 Feb 2;39(2):104-113. doi: 10.20344/amp.23847. Epub 2026 Feb 2.

ABSTRACT

INTRODUCTION: Dementia is one of the leading causes of dependency among older people and poses a critical challenge for long-term care systems. Despite the importance of the issue, national data on the prevalence of dementia in residential care homes remain limited.

METHODS: A cross-sectional, observational, and institution-based study was conducted within the framework of the SINDIA project. The study was based on an online survey addressed to the technical directors of residential care homes for older people in Portugal, carried out between January and July 2024. The questionnaire collected information on institutional characteristics (sector, territorial location, base monthly fee, dementia specialization, and total number of residents) and on the prevalence of formally diagnosed dementia cases and of cognitive decline without a recorded diagnosis. Data were analyzed using the R software (version 4.1.2). Mean percentages and 95% confidence intervals (Student’s t-method), weighted by NUTS-2 region, were calculated. A hierarchical cluster analysis (Ward’s method) was also performed to identify distinct institutional profiles.

RESULTS: On average, 31.7% of residents had a formal dementia diagnosis and 22.3% showed signs of undiagnosed cognitive decline, resulting in 50.2% of the resident population presenting some degree of cognitive impairment, after data cleaning. The proportion varied across territories, institutional sectors, monthly fees and self-reported specialization. A cluster analysis identified three distinct institutional profiles, with a majority group of facilities characterized by lower diagnostic formalization, especially in the non-profit sector and among lower-cost institutions.

CONCLUSION: The findings are suggestive of a very high prevalence of cognitive impairment in Portuguese residential care homes. These results highlight the need for public policies aimed at improving early diagnosis, enhancing staff training, and reducing territorial and institutional inequalities in the response to dementia.

PMID:41687112 | DOI:10.20344/amp.23847

JMIR Res Protoc. 2026 Feb 13;15:e85493. doi: 10.2196/85493.

ABSTRACT

BACKGROUND: In the United States, Asian American people represent the fastest growing population group, and are highly diverse linguistically, culturally, and demographically. Yet, in most national studies, Asian American groups are aggregated, masking potential health disparities. Racial and ethnic minorities, especially first-generation immigrants, are also at a particularly elevated risk of cognitive impairment.

OBJECTIVE: The Aging in Kerala Americans Research (AKKARE) study aims to examine both positive and negative migration effects on health in the first-generation Kerala American population, focusing on cognition and dementia. We will assess the effect of immigrant and cultural factors and social relations on cognitive aging from epidemiological, biological, and vascular perspectives. This protocol describes the study design and procedures for the AKKARE study.

METHODS: The AKKARE study proposes to enroll 400 older first-generation Kerala American individuals from the tristate area. A smaller subset of these participants will complete blood tests (n=360) and neuroimaging studies (n=160). We will assess the role of immigration and cultural effects on cognitive function, mood, and quality of life, as well as biological and vascular aging. We will conduct follow-up assessments at 12-month intervals for up to 5 years.

RESULTS: The AKKARE study (grant #1R01AG084567-01) was funded by the US National Institutes of Health in 2024 and received approval from the Stony Brook University Institutional Review Board to start the study in 2025. Enrollment began in September 2025.

CONCLUSIONS: As there is presently a lack of fundamental data on the epidemiology in diseases of aging in Indian American immigrants, the AKKARE study will provide new insights into factors of risk and resilience associated with cognitive impairment in this group and in the broader older adult population.

INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID): DERR1-10.2196/85493.

PMID:41687108 | DOI:10.2196/85493

JMIR Public Health Surveill. 2026 Feb 13;12:e89473. doi: 10.2196/89473.

ABSTRACT

BACKGROUND: Despite major biomedical advances in HIV testing, prevention, and treatment, annual HIV transmissions in the United States remain above 30,000. Geographic access to pre-exposure prophylaxis (PrEP) is critical to HIV prevention efforts, particularly in regions with high HIV burdens, such as metro-Atlanta. Community-based organizations (CBOs) play a central role in delivering culturally competent prevention services, yet many rely on federal funding that is increasingly unstable. Understanding the potential impact of CBO closures on geographic access to PrEP is essential for anticipating inequities and informing policy.

OBJECTIVE: The aim of this study was to estimate how hypothetical closures of federally funded CBOs providing PrEP affect geographic access to PrEP clinics by car and public transit across metro-Atlanta and to assess whether impacts differ by community racial/ethnic composition.

METHODS: We identified 71 PrEP-providing clinics in metro-Atlanta (August 2025), including 12 CBOs. Using 3 simulated closure scenarios in which 25% of CBOs were randomly closed, we calculated one-way travel times from 2466 census block group (CBG) centroids to the nearest PrEP-providing clinic. Travel times were estimated for car and public transit across 3 weekdays and timepoints and then averaged per CBG. Two-sided paired t tests were used to compare the change in travel time compared to baseline. Logistic regression assessed associations between racial/ethnic plurality and increased travel times.

RESULTS: Under baseline conditions, 100% of CBGs had car access to a PrEP clinic within 30 minutes compared to only 41.6% (1027/2466) via public transit. Across closure scenarios, 732 CBGs (29.6%; representing over 1 million residents) experienced increased transit times (mean increase 1.2 minutes; range 0.0-11.6; P<.001), and 7 CBGs lost transit access entirely. For car travel, 1184 CBGs (48%; representing approximately 1.7 million residents) experienced increased drive times (mean increase 0.5 minutes; range 0.0-6.4; P=.03). Black-plurality CBGs had higher odds of increased drive times compared to White-plurality CBGs (odds ratio 1.37, 95% CI 1.15-1.63).

CONCLUSIONS: Even limited closure of CBO PrEP providers meaningfully reduces geographic access to HIV prevention services, disproportionately affecting communities already experiencing transportation and HIV-related vulnerabilities. Sustained federal investment in CBOs is essential to preserve equitable PrEP access and prevent avoidable HIV infections.

PMID:41687101 | DOI:10.2196/89473

J Particip Med. 2026 Feb 13;18:e83149. doi: 10.2196/83149.

ABSTRACT

BACKGROUND: The Veterans Health Administration is promoting patient-reported outcome measure (PROM) collection for measurement-based mental health care. Understanding veteran preferences about how and when to complete PROMs is critical to support their implementation.

OBJECTIVE: We examined veteran preferences for timing and use of different technology platforms to complete mental health-related PROMs.

METHODS: We invited a national sample of 1373 veterans to complete a survey; 858 (62.5%) responded. Surveys asked about veteran preferences for how and when to complete mental health-related PROMs. We characterized responses using descriptive statistics and estimated multiple logistic regression models to examine associations between veteran demographic and health characteristics and preferences for completing PROMs.

RESULTS: Most veterans preferred completing PROMs between appointments (607/801, 75.8%) using features of a patient portal (410/801, 51.2%), during appointments (589/801, 73.5%) verbally (413/801, 51.6%), and while at the medical center (480/801, 59.9%) on paper (189/801, 23.6%) or a tablet computer (180/801, 22.5%). Hispanic (vs non-Hispanic) veterans had 3.32 (95% CI 1.04-10.58) times higher odds of preferring to complete PROMs at the medical center, and veterans with lower (vs higher) socioeconomic status had lower odds (odds ratio 0.61, 95% CI 0.40-0.93) of preferring to complete PROMs in between appointments but 1.97 (95% CI 1.23-3.16) times higher odds of preferring to complete PROMs during appointments.

CONCLUSIONS: As the Veterans Health Administration and other health care systems seek to expand the integration of PROM data into health care services, adaptive and flexible approaches to PROM administration that align with patient preferences, including those that leverage technology platforms in the remote collection of these data, may bolster implementation. Our results indicate that such implementation efforts should consider patient ethnicity and socioeconomic status. Our findings further suggest that these efforts could benefit from incorporating PROM administration into online patient portals, developing mobile health apps that support PROM completion through patients’ personal devices in between clinical encounters, and engaging care team members in PROM administration during appointments.

PMID:41687098 | DOI:10.2196/83149

JMIR Public Health Surveill. 2026 Feb 13;12:e82496. doi: 10.2196/82496.

ABSTRACT

BACKGROUND: In France, reluctance toward hepatitis B vaccination remains high, despite the availability of a safe and effective vaccine to prevent this infection. To boost vaccination coverage, it is therefore essential to identify the factors that are likely to encourage a more favorable opinion of this vaccine. Health literacy (HL) is one such factor. It refers to the individual ability to access, understand, critically appraise, and apply health information to make informed decisions about health issues for oneself and for others.

OBJECTIVE: This study explored the mechanisms through which HL might affect opinions about hepatitis B vaccination, both directly and indirectly, by relevant factors, including opinions about vaccination in general, trust in government health agencies, and trust in medical doctors.

METHODS: The analysis used data from the SLAVACO-Wave 3 (Suivi Longitudinal des Attitudes à l’Égard d’un Vaccin Contre la COVID-19) survey, conducted in December 2021 among a representative sample of French adults (N=1932). Favorable and unfavorable opinions of hepatitis B vaccination were measured using a 5-point Likert scale, while HL was assessed using the HLS₁₉-Q12 questionnaire (12-item general health literacy questionnaire used in Health Literacy Survey 2019-2021). A structural equation model examined the relationship between HL and hepatitis B vaccination opinions, taking into account the potential mediating role of trust in the health care system (ie, government health agencies and medical doctors).

RESULTS: Findings showed that individuals with a favorable opinion of hepatitis B vaccination (1437/1932, 74.4%) had a higher HL level than those with a negative or neutral opinion (62.6 vs 57.0, P<.001). The association between HL and hepatitis B vaccination opinions was fully mediated by trust in the health care system. The indirect effect of HL was estimated at 0.068 (95% CI 0.042-0.093), accounting for 52.4% (0.068/0.1297) of the total effect. This effect was particularly pronounced in people over 50 years (0.084, 95% CI 0.042-0.126, accounting for 0.084/0.1306, 64.3% of the total effect). Goodness-of-fit indicators were satisfactory.

CONCLUSIONS: Enhancing HL might positively influence hepatitis B vaccination opinions and uptake through greater trust in the health care system. From a public health perspective, strategies should go beyond providing clear information and access to vaccines and actively work to strengthen trust in health care institutions and professionals. National campaigns correcting misconceptions about hepatitis B vaccination could be complemented by targeted interventions for groups most likely to hold negative opinions. Repeating this survey in the post-COVID-19 context could also reveal different trends, given evolving public perceptions of vaccines and health authorities.

PMID:41687090 | DOI:10.2196/82496

J Neurosurg Pediatr. 2026 Feb 13:1-12. doi: 10.3171/2025.9.PEDS25180. Online ahead of print.

ABSTRACT

OBJECTIVE: Neural tube defects (NTDs) represent a significant global concern, impacting an estimated 300,000 individuals each year. Sub-Saharan Africa (SSA) is considerably affected due to various biopsychosocial factors, dietary issues such as folic acid deficiency, and fumonisin-contaminated maize consumption, and sex-based disparities. This study sought to understand epidemiology and trends in NTD in SSA from 1990 to 2021.

METHODS: The Global Burden of Disease database was utilized to obtain epidemiological data on the variables of interest, which included disability-adjusted life years (DALYs), incidence, prevalence, and mortality of patients with NTD in SSA. The countries in SSA were divided into 4 separate regions-Central, Eastern, Western, and Southern-based on the designations by the African Union. Variations in measurements of NTDs between regions in SSA were assessed using R Studio, and statistical significance was determined with a threshold p value of < 0.05.

RESULTS: The global burden of NTDs was significantly lower than the burden of NTDs in Central, Eastern, and Western SSA (p < 0.0001). Among the regions, Southern SSA experienced better outcomes in terms of DALYs, mortality, incidence, and prevalence, compared to the other regions of SSA (p < 0.001). When a sex-specific burden analysis was performed, female sex was associated with higher DALYs and mortality of NTDs within SSA, especially in Western SSA (p < 0.0001). Other regions of the world, including North America, Latin America and Caribbean, Europe and Central Asia, and Middle East and Northern Africa, also showed associations between female sex and higher DALYs and mortality of NTDs (p < 0.05). When the incidence and prevalence of NTDs was analyzed, there were mixed results, as female sex was associated with higher and lower rates in different regions of the world.

CONCLUSIONS: Understanding the epidemiology of NTDs in SSA underscores the need for quality interventions that not only increase disease awareness and healthcare access but strive for prevention. With identification of the multifaceted factors contributing to NTDs and promotion of proactive health practices, significant strides could be made toward reducing the incidence of NTDs. Partnerships between governments and international agencies are vital to mobilize resources and reduce the burden and related health disparities.

PMID:41687089 | DOI:10.3171/2025.9.PEDS25180

Prim Care Companion CNS Disord. 2026 Feb 12;28(1):25m04071. doi: 10.4088/PCC.25m04071.

ABSTRACT

Objective: To examine the prevalence and clinical correlates of suicidal mental imagery among individuals who have attempted suicide in India.

Methods: This cross-sectional study included 63 participants who recently attempted suicide. Assessments included the Mini-International Neuropsychiatric Interview, Version 6, suicidality subscale; Patient Health Questionnaire-9; Beck Suicide Intent Scale; Scale for Assessment of Lethality of Suicide Attempt; and a sociodemographic data questionnaire. Data were collected from June 2023 to April 2024.

Results: The majority of participants were unemployed, educated, unmarried, and from nuclear families and rural backgrounds. Common attempt methods were drug overdose and poisoning. Of the participants, 79.4% reported past mental illness. Suicidal mental imagery was present in 38.1% of participants. Associations were found with female sex, unemployment, past mental illness, and higher depression/suicidality scores.

Conclusions: The relationship between depression, suicidality, and mental imagery suggests that addressing imagery could be important for treatment and prevention.

Prim Care Companion CNS Disord 2026;28(1):25m04071.

Author affiliations are listed at the end of this article.

PMID:41687087 | DOI:10.4088/PCC.25m04071

Acta Med Port. 2026 Feb 13. doi: 10.20344/amp.23078. Online ahead of print.

ABSTRACT

Survival analysis is a fundamental tool in clinical research for evaluating time-to-event outcomes. While the Kaplan-Meier method remains a widely used univariable approach for estimating survival probabilities and comparing groups, it does not account for multiple risk factors simultaneously. To address this limitation, multivariable regression models are employed, with the Cox proportional hazards model (Cox regression) being the most commonly used. This paper provides a practical guide to Cox regression for clinicians, emphasizing its application in survival analysis rather than focusing on mathematical derivations. We discuss key concepts, including hazard ratios, model assumptions, variable selection, and interpretation of results. Additionally, we explore essential methodological considerations, such as assessing proportional hazards assumptions, handling missing data, and avoiding overfitting. By offering a step-by-step approach to implementing Cox regression in clinical research, this article aims to enhance understanding and improve the quality of survival analysis in medical studies. Practical examples illustrate how to interpret Cox regression results and their relevance in clinical decision-making.

PMID:41687085 | DOI:10.20344/amp.23078