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Surveillance bias

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https://www.readbyqxmd.com/read/28631295/an-em-algorithm-for-nonparametric-estimation-of-the-cumulative-incidence-function-from-repeated-imperfect-test-results
#1
Birgit I Witte, Johannes Berkhof, Marianne A Jonker
In screening and surveillance studies, event times are interval censored. Besides, screening tests are imperfect so that the interval at which an event takes place may be uncertain. We describe an expectation-maximization algorithm to find the nonparametric maximum likelihood estimator of the cumulative incidence function of an event based on screening test data. Our algorithm has a closed-form solution for the combined expectation and maximization step and is computationally undemanding. A simulation study indicated that the bias of the estimator tends to zero for large sample size, and its mean squared error is in general lower than the mean squared error of the estimator that assumes the screening test is perfect...
June 20, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/28606821/analysis-of-synonymous-codon-usage-in-zika-virus
#2
Snawar Hussain, Sahibzada Tasleem Rasool
Zika virus is a zoonotic pathogen, which have made frequent incursion into the human population in Africa and South East Asia over the course of several decades but never reached to the pandemic proportions until the most recent outbreak. Viruses are solely dependent on host synthetic machinery for their replication cycle; therefore, replication and persistence in a host species of different genetic background requires certain degree of adaptation. These adaptations are necessary to avoid detection from host immune surveillance and maximize the utilization of available resources for efficient viral replication...
June 9, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28604791/challenges-in-developing-methods-for-quantifying-the-effects-of-weather-and-climate-on-water-associated-diseases-a-systematic-review
#3
Giovanni Lo Iacono, Ben Armstrong, Lora E Fleming, Richard Elson, Sari Kovats, Sotiris Vardoulakis, Gordon L Nichols
Infectious diseases attributable to unsafe water supply, sanitation and hygiene (e.g. Cholera, Leptospirosis, Giardiasis) remain an important cause of morbidity and mortality, especially in low-income countries. Climate and weather factors are known to affect the transmission and distribution of infectious diseases and statistical and mathematical modelling are continuously developing to investigate the impact of weather and climate on water-associated diseases. There have been little critical analyses of the methodological approaches...
June 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28599299/neoadjuvant-radiation-followed-by-resection-versus-upfront-resection-for-locally-advanced-pancreatic-cancer-patients-a-propensity-score-matched-analysis
#4
Xing Chen, Geng Liu, Kaiqiang Wang, Guodong Chen, Jinjin Sun
BACKGROUND AND AIM: To compare cancer-specific survival (CSS) between patients who received neoadjuvant radiation followed by resection (NRR) and those who received upfront resection (UR) for locally advanced pancreatic cancer (LAPC). METHODS: A total of 772 LAPC patients who underwent curative-intent surgical resection with or without neoadjuvant radiation from 2004 to 2013 were identified from the Surveillance, Epidemiology, and End Result (SEER) database. Propensity score matching (PSM) was conducted to eliminate possible bias...
May 23, 2017: Oncotarget
https://www.readbyqxmd.com/read/28598495/ultrasonography-for-endoleak-detection-after-endoluminal-abdominal-aortic-aneurysm-repair
#5
REVIEW
Iosief Abraha, Maria Laura Luchetta, Rita De Florio, Francesco Cozzolino, Giovanni Casazza, Piergiorgio Duca, Basso Parente, Massimiliano Orso, Antonella Germani, Paolo Eusebi, Alessandro Montedori
BACKGROUND: People with abdominal aortic aneurysm who receive endovascular aneurysm repair (EVAR) need lifetime surveillance to detect potential endoleaks. Endoleak is defined as persistent blood flow within the aneurysm sac following EVAR. Computed tomography (CT) angiography is considered the reference standard for endoleak surveillance. Colour duplex ultrasound (CDUS) and contrast-enhanced CDUS (CE-CDUS) are less invasive but considered less accurate than CT. OBJECTIVES: To determine the diagnostic accuracy of colour duplex ultrasound (CDUS) and contrast-enhanced-colour duplex ultrasound (CE-CDUS) in terms of sensitivity and specificity for endoleak detection after endoluminal abdominal aortic aneurysm repair (EVAR)...
June 9, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28593128/including-mobile-only-telephone-users-in-a-statewide-preventive-health-survey-differences-in-the-prevalence-of-health-risk-factors-and-impact-on-trends
#6
Bernard Baffour, Tim Roselli, Michele Haynes, Joshua J Bon, Mark Western, Susan Clemens
The Queensland preventive health survey is conducted annually to monitor the prevalence of behavioural risk factors in the north-east Australian state. Prompted by domestic and international trends in mobile telephone usage, the 2015 survey incorporated both mobile and landline telephone numbers from a list-based sampling frame. Estimates for landline-accessible and mobile-only respondents are compared to assess potential bias in landline-only surveys in the context of public health surveillance. Significant differences were found in subcategories of all health prevalence estimates considered (alcohol consumption, body mass index, smoking, and physical activity) from 2015 survey results...
September 2017: Preventive Medicine Reports
https://www.readbyqxmd.com/read/28591355/effect-of-the-inclusion-of-mobile-phone-interviews-to-vigitel
#7
Regina Tomie Ivata Bernal, Deborah Carvalho Malta, Rafael Moreira Claro, Carlos Augusto Monteiro
OBJECTIVE: To evaluate the impact on the prevalence changes of risk factors for chronic diseases, published in the Surveillance System of Risk and Protection Factors for Chronic Diseases by Telephone Survey (Vigitel), after the inclusion of data from the population only with mobile phone. METHODS: Our study used data from the 26 State capitals and Federal District of Brazil obtained by the National Survey on Health (PNS) and Vigitel, both held in 2013. In each capital, we added a subsample of 200 adults living in households with only mobile phones, extracted from PNS, to the Vigitel 2013 database, with approximately 1,900 households, named Vigitel dual frame...
June 1, 2017: Revista de Saúde Pública
https://www.readbyqxmd.com/read/28591202/epidemiological-features-of-influenza-circulation-in-swine-populations-a-systematic-review-and-meta-analysis
#8
Eugénie Baudon, Marisa Peyre, Malik Peiris, Benjamin John Cowling
BACKGROUND: The emergence of the 2009 influenza pandemic virus with a swine origin stressed the importance of improving influenza surveillance in swine populations. The objectives of this systematic review and meta-analysis were to describe epidemiological features of swine influenza (SI) across the world and identify factors impacting swine influenza virus surveillance. METHODS: The systematic review followed the PRISMA guidelines. Articles published after 1990 containing data on SI on pig and herd-level seroprevalence, isolation and detection rates, and risk factors were included...
2017: PloS One
https://www.readbyqxmd.com/read/28575179/measurement-bias-of-gross-pathologic-compared-with-radiologic-tumor-size-of-resected-lung-adenocarcinomas-implications-for-the-t-stage-revisions-in-the-eighth-edition-of-the-american-joint-committee-on-cancer-staging-manual
#9
Kevin R Anderson, Benedikt H Heidinger, Yigu Chen, Alexander A Bankier, Paul A VanderLaan
Objectives: The eighth edition of the AJCC Cancer Staging Manual now stratifies the T descriptor for lung cancers by each increasing 1.0 cm increment, up to 5.0 cm, with an additional category for tumor greater than 7.0 cm. Bias in pathologic versus radiologic measurements may impact tumor staging. Methods: The gross pathologic measurements of 493 resected lung adenocarcinomas were compared with presurgical computed tomography radiologic measurements. Also, pathologic tumor measurement data from the Surveillance, Epidemiology, and End Results (SEER) program database were examined...
June 1, 2017: American Journal of Clinical Pathology
https://www.readbyqxmd.com/read/28572867/prolaris-cell-cycle-progression-test-for-localized-prostate-cancer-a-health-technology-assessment
#10
(no author information available yet)
BACKGROUND: Prostate cancer is very common and many localized tumours are non-aggressive. Determining which cancers are aggressive is important for choosing the most appropriate treatment (e.g., surgery, radiation, active surveillance). Current clinical risk stratification is reliable in forecasting the prognosis of groups of men with similar clinical and pathologic characteristics, but there is residual uncertainty at the individual level. The Prolaris cell cycle progression (CCP) test, a genomic test that estimates how fast tumour cells are proliferating, could potentially be used to improve the accuracy of individual risk assessment...
2017: Ontario Health Technology Assessment Series
https://www.readbyqxmd.com/read/28525991/correcting-for-day-of-the-week-and-public-holiday-effects-improving-a-national-daily-syndromic-surveillance-service-for-detecting-public-health-threats
#11
Elizabeth Buckingham-Jeffery, Roger Morbey, Thomas House, Alex J Elliot, Sally Harcourt, Gillian E Smith
BACKGROUND: As service provision and patient behaviour varies by day, healthcare data used for public health surveillance can exhibit large day of the week effects. These regular effects are further complicated by the impact of public holidays. Real-time syndromic surveillance requires the daily analysis of a range of healthcare data sources, including family doctor consultations (called general practitioners, or GPs, in the UK). Failure to adjust for such reporting biases during analysis of syndromic GP surveillance data could lead to misinterpretations including false alarms or delays in the detection of outbreaks...
May 19, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28509356/assessments-of-pain-in-children-and-adolescents-with-cerebral-palsy-a-retrospective-population-based-registry-study
#12
Lena Westbom, Amanda Rimstedt, Eva Nordmark
AIM: To explore pain screening in CPUP, a follow-up surveillance programme for people with cerebral palsy (CP), specifically to describe reported pain prevalence, localizations, patterns of distribution; to compare with studies using psychometrically sound assessment instruments; and to assess agreement between pain documented in CPUP and medical records. METHOD: Registry study of a population with CP, born 1993 to 2008, living in Skåne, Sweden in 2013. Descriptive data, cross-tabulations, and chi-square tests to characterize and compare the study groups...
May 16, 2017: Developmental Medicine and Child Neurology
https://www.readbyqxmd.com/read/28501338/risk-factors-for-metabolic-syndrome-after-liver-transplantation-a-systematic-review-and-meta-analysis
#13
REVIEW
Line Buch Thoefner, Andreas Arendtsen Rostved, Hans-Christian Pommergaard, Allan Rasmussen
INTRODUCTION: Metabolic syndrome is associated with increased risk of cardiovascular events, which contributes to the elevated mortality rate among liver transplant recipients. The objective of this systematic review and meta-analysis was to assess the prevalence and risk factors for metabolic syndrome after liver transplantation. METHODS: The databases Medline and Scopus were searched for observational studies evaluating prevalence and risk factors for metabolic syndrome after liver transplantation...
April 23, 2017: Transplantation Reviews
https://www.readbyqxmd.com/read/28492929/hepatitis-c-virus-infection-among-reproductive-aged-women-and-children-in-the-united-states-2006-to-2014
#14
Kathleen N Ly, Ruth B Jiles, Eyasu H Teshale, Monique A Foster, Rick L Pesano, Scott D Holmberg
Background: In the United States, hepatitis C virus (HCV) infection has increased among young persons who inject drugs, but the extent of this epidemic among reproductive-aged women and their children is unknown. Objective: To estimate numbers and describe characteristics of reproductive-aged women with HCV infection and of their offspring. Design: Analysis of the National Notifiable Diseases Surveillance System (NNDSS) from 2006 to 2014 and the Quest Diagnostics Health Trends national database from 2011 to 2014...
June 6, 2017: Annals of Internal Medicine
https://www.readbyqxmd.com/read/28465095/association-of-influenza-vaccination-during-pregnancy-with-birth-outcomes-in-nicaragua
#15
Carmen S Arriola, Nancy Vasconez, Mark G Thompson, Sonja J Olsen, Ann C Moen, Joseph Bresee, Alba María Ropero
BACKGROUND: Studies have shown that influenza vaccination during pregnancy reduces the risk of influenza disease in pregnant women and their offspring. Some have proposed that maternal vaccination may also have beneficial effects on birth outcomes. In 2014, we conducted an observational study to test this hypothesis using data from two large hospitals in Managua, Nicaragua. METHODS: We conducted a retrospective cohort study to evaluate associations between influenza vaccination and birth outcomes...
May 25, 2017: Vaccine
https://www.readbyqxmd.com/read/28462943/media-reporting-of-protect-a-disconnect-in-information-dissemination
#16
M E Westerman, B Bhindi, R Choo, M T Gettman, R J Karnes, L Klotz, S A Boorjian
BACKGROUND: Given the central role of the media in disseminating information to the public, we analyzed news coverage of the recent publication from ProtecT to assess views on treatment, the level of detail presented and degree of bias. METHODS: We applied a predefined search strategy to identify all news articles reporting on ProtecT within 30 days of its publication. Articles were independently assessed by two urologists and two lay persons using five-point Likert scales...
May 2, 2017: Prostate Cancer and Prostatic Diseases
https://www.readbyqxmd.com/read/28462471/how-many-transgender-men-are-there-in-san-francisco
#17
Willi McFarland, Erin Wilson, H Fisher Raymond
The purpose of this study was to estimate the number of transgender men (transmen) adults living in San Francisco. We integrated two population size estimation methods into a community-based health survey of transmen (n = 122) in the San Francisco Bay Area in 2014-2015: the service multiplier and wisdom of the crowds. The median estimate was 806 transmen adults in San Francisco (0.11% of adults) and 4027 in the Bay Area. Considering potential biases, we believe our estimates are conservative. Knowing the denominator of persons at risk for health conditions is necessary for public health planning, surveillance, and impact evaluation...
May 1, 2017: Journal of Urban Health: Bulletin of the New York Academy of Medicine
https://www.readbyqxmd.com/read/28462378/genomics-endoscopy-and-control-of-gastroesophageal-cancers-a-perspective
#18
REVIEW
Brian J Reid
In The Cancer Genome Atlas the goals were to define how to treat advanced cancers with targeted therapy. However, the challenges facing cancer interception for early detection and prevention include length bias in which current screening and surveillance approaches frequently miss rapidly progressing cancers that then present at advanced stages in the clinic with symptoms (underdiagnosis). In contrast, many early detection strategies detect benign conditions that may never progress to cancer during a lifetime, and the patient dies of unrelated causes (overdiagnosis)...
May 2017: Cellular and Molecular Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/28461760/results-of-adjuvant-radiation-therapy-for-locoregional-perihilar-cholangiocarcinoma-after-curative-intent-resection
#19
Kai-Ming Leng, Yue-Ping Liu, Zhi-Dong Wang, Xiang-Yu Zhong, Guan-Qun Liao, Peng-Cheng Kang, Yun-Fu Cui, Xing-Ming Jiang
PURPOSE: This study sought to define the role of adjuvant radiation therapy (RT) for patients with curative intent resection of perihilar cholangiocarcinoma (pCCA). PATIENTS AND METHODS: By using the Surveillance, Epidemiology and End Results (SEER) registry, 1,917 patients with non-metastatic pCCA who underwent surgical resection from 1988 to 2009 were included in this study. Propensity score methods were used to compare the survival outcomes of patients treated with and without adjuvant RT after controlling for selection bias...
2017: OncoTargets and Therapy
https://www.readbyqxmd.com/read/28446259/estimating-the-real-incidence-of-invasive-listeriosis-through-an-integrated-surveillance-model-in-use-in-lombardy-italy-2006-2014
#20
A Zolin, E Amato, M D'Auria, M Gori, P Huedo, A Bossi, M Pontello
The annual incidence of listeriosis in Italy is lower (0·19-0·27 per 100 000 inhabitants per year) than in Europe (0·34-0·52 per 100 000 inhabitants per year). Since the observed incidence of listeriosis may be biased downward for underdiagnosis or under-reporting, this work aims to estimate the real incidence of listeriosis during a 9-year period in the Lombardy region, Italy. Data on listeriosis cases were collected from national mandatory notification system (MAINF) and Laboratory-based Surveillance System (LabSS)...
April 27, 2017: Epidemiology and Infection
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