Changyong Feng

ORCID: 0000-0002-4432-1565
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About
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Research Areas
  • Prostate Cancer Diagnosis and Treatment
  • Statistical Methods and Bayesian Inference
  • Dental Implant Techniques and Outcomes
  • Statistical Methods and Inference
  • Dental materials and restorations
  • Dental Health and Care Utilization
  • Orthodontics and Dentofacial Orthopedics
  • Prostate Cancer Treatment and Research
  • Statistical Methods in Clinical Trials
  • Oral microbiology and periodontitis research
  • Bladder and Urothelial Cancer Treatments
  • Dental Research and COVID-19
  • Dental Radiography and Imaging
  • Periodontal Regeneration and Treatments
  • Health Systems, Economic Evaluations, Quality of Life
  • Temporomandibular Joint Disorders
  • Advanced Statistical Methods and Models
  • Anesthesia and Pain Management
  • Urinary and Genital Oncology Studies
  • Urological Disorders and Treatments
  • Cancer survivorship and care
  • Advanced Causal Inference Techniques
  • HIV Research and Treatment
  • Influenza Virus Research Studies
  • Urologic and reproductive health conditions

Simon Fraser University
2025

University of Rochester Medical Center
2015-2024

University of Rochester
2015-2024

Jiaxing Hengchuang Electric Design and Research Institute
2024

Hangzhou Dianzi University
2023

Creative Commons
2018

Eastman Chemical Company (United States)
2018

Université de Lille
2018

University of California, San Diego
2017

American College of Surgeons
2013

The log-transformation is widely used in biomedical and psychosocial research to deal with skewed data. This paper highlights serious problems this classic approach for dealing Despite the common belief that log transformation can decrease variability of data make conform more closely normal distribution, usually not case. Moreover, results standard statistical tests performed on log-transformed are often relevant original, non-transformed data.We demonstrate these by presenting examples use...

10.3969/j.issn.1002-0829.2014.02.009 article EN PubMed 2014-04-01

The hereditary long-QT syndrome is characterized by prolonged ventricular repolarization and a variable clinical course with arrhythmia-related syncope sudden death. Mutations involving the human ether-a-go-go-related gene (HERG) channel are responsible for LQT2 form of syndrome, in cellular expression studies these mutations associated reduction rapid component delayed rectifier repolarizing current (I(Kr)). We investigated features prognostic implications pore nonpore regions HERG this...

10.1161/hc0702.105124 article EN Circulation 2002-02-19

Sex, race, and age at diagnosis have a significant impact on mortality from bladder cancer (BC). Women, African Americans of both sexes, the elderly, all experience higher rates. Tumor grade, stage, histologic type presentation also affect outcome. To determine whether tumor characteristics alone explain excess hazard death BC observed in some demographic groups, authors queried Surveillance, Epidemiology, End Results (SEER) limited-use database for presentations outcomes between 1990...

10.1002/cncr.23986 article EN Cancer 2008-12-16

Agreement and correlation are widely-used concepts that assess the association between variables. Although similar related, they represent completely different notions of association. Assessing agreement variables assumes measure same construct, while can be assessed for constructs. This conceptual difference requires use statistical methods, when assessing or correlation, method may vary depending on distribution data interest investigator. For example, Pearson a popular continuous...

10.11919/j.issn.1002-0829.216045 article EN Shanghai jingshen yixue 2016-04-25

In clinical research, comparisons of the results from experimental and control groups are often encountered. The two-sample t-test (also called independent samples t-test) paired probably most widely used tests in statistics for comparison mean values between two samples. However, confusion exists with regard to use test methods, resulting their inappropriate use. this paper, we discuss differences similarities these t-tests. Three examples illustrate calculation procedures...

10.11919/j.issn.1002-0829.217070 article EN PubMed 2017-06-25

The log transformation has been widely used in biomedical research to deal with the skewed data. However, medical publications, we have found many misuses and misinterpretations of analysis based on log‐transformed In this paper, list some common scenarios misuse misinterpretation applications. We also provide both theoretical practical justifications support our viewpoints. Copyright © 2012 John Wiley & Sons, Ltd.

10.1002/sim.5486 article EN Statistics in Medicine 2012-07-16

In Brief OBJECTIVE: To assess the effect of low-dose mifepristone on quality life, pain, bleeding, and uterine size among women with symptomatic leiomyomata. METHODS: Forty-two leiomyomata volume 160 mL or more were randomized to mifepristone, 5 mg daily, placebo for 26 weeks. Quality life (Uterine Fibroid Symptoms Life Questionnaire Medical Outcomes Study 36-Item Short Form survey) leiomyoma (ultrasonography) assessed at baseline, 1 month, 3 months, 6 months treatment. Bleeding (daily logs...

10.1097/01.aog.0000243776.23391.7b article EN Obstetrics and Gynecology 2006-12-01

Abstract BACKGROUND. The objectives of this study were to determine whether bladder cancer (BC) screening in healthy men could lead earlier detection and reduced BC mortality compared with unscreened long‐term outcomes a geographically defined, population newly diagnosed BC. METHODS. In 1987 from 1998 1992, 1575 ages 50 years older who solicited well patient rosters clinics around Madison, Wisconsin, tested their urine repetitively chemical reagent strip for hemoglobin. Participants had...

10.1002/cncr.22224 article EN Cancer 2006-10-06

Abstract Purpose: The objective of this study was to compare the effect veneering porcelain (monolithic or bilayer specimens) and core fabrication technique (heat‐pressed CAD/CAM) on biaxial flexural strength Weibull modulus leucite‐reinforced lithium‐disilicate glass ceramics. In addition, powder/liquid layering) for zirconia ceramics studied. Materials Methods: Five ceramic materials (IPS Empress Esthetic, IPS CAD, e.max Press, ZirCAD) three corresponding porcelains Esthetic Veneer, Ceram,...

10.1111/j.1532-849x.2012.00845.x article EN Journal of Prosthodontics 2012-03-29

Candida albicans is an opportunistic fungal organism frequently detected in the oral cavity of children with severe early childhood caries (S-ECC). Previous studies suggested cariogenic potential C. albicans, vitro and vivo, further demonstrated its synergistic interactions Streptococcus mutans. In combination, 2 organisms are associated higher severity a rodent model. However, it remains unknown whether influences composition diversity entire bacterial community to promote S-ECC onset. With...

10.1177/0022034518790941 article EN Journal of Dental Research 2018-07-26

Introduction Candida albicans has been detected together with Streptococcus mutans in high numbers plaque-biofilm from children early childhood caries (ECC). The goal of this study was to examine the C. carriage severe (S-ECC) and maternal relatedness. Methods Subjects pilot cross-sectional were recruited based on a convenient sample. DMFT(S)/dmft(s) plaque scores assessed during comprehensive oral exam. Social-demographic related background information collected through questionnaire....

10.1371/journal.pone.0164242 article EN cc-by PLoS ONE 2016-10-14

Abstract Introduction Psoriatic arthritis (PsA) is a chronic inflammatory characterized by bone erosion mediated osteoclasts (OC). Our previous studies showed an elevated frequency of OC precursors (OCP) in PsA patients. Here, we examined if arise from CD16-positive monocytes PsA. Methods Peripheral blood mononuclear cells (PBMC) or were isolated human peripheral and sorted based on CD16 expression. Sorted cultured alone with wafers the presence receptor activator nuclear factor kappa-B...

10.1186/ar2915 article EN cc-by Arthritis Research & Therapy 2010-01-26

Abstract Osteoclasts (OC) are bone-resorbing, multinucleated cells that generated via fusion of OC precursors (OCP). The frequency OCP is elevated in patients with erosive inflammatory arthritis and metabolic bone diseases. Although many cytokines cell surface receptors known to participate osteoclastogenesis, the molecular mechanisms underlying regulation this cellular transformation poorly understood. Herein, we focused our studies on text-decoration:underlineendritic...

10.1002/jbmr.531 article EN Journal of Bone and Mineral Research 2011-10-10

Abstract The generalized linear mixed‐effects model (GLMM) is a popular paradigm to extend models for cross‐sectional data longitudinal setting. When applied modeling binary responses, different software packages and even procedures within package may give quite results. In this report, we describe the statistical approaches that underlie these discuss their strengths weaknesses when fit correlated responses. We then illustrate considerations by applying implemented in some simulated real...

10.1002/sim.4265 article EN Statistics in Medicine 2011-06-10

Abstract Introduction As a group, rheumatoid arthritis (RA) patients exhibit increased risk of infection, and those treated with anti-tumor necrosis factor (TNF) therapy are at further risk. This susceptibility may result from compromised humoral immune response. Therefore, we asked if short-term effector (d5-d10) memory (1 month or later) B cell responses to antigen were in RA anti-TNF therapy. Methods Peripheral blood samples obtained patients, including subset anti-TNF, healthy controls...

10.1186/ar3542 article EN cc-by Arthritis Research & Therapy 2011-12-16

No AccessJournal of UrologyAdult Urology1 Jan 2018A Comprehensive Analysis Cribriform Morphology on Magnetic Resonance Imaging/Ultrasound Fusion Biopsy Correlated with Radical Prostatectomy Specimensis corrected byErratum Matthew Truong, Changyong Feng, Gary Hollenberg, Eric Weinberg, Edward M. Messing, Hiroshi Miyamoto, and Thomas P. Frye TruongMatthew Truong Department Urology, University Rochester Medical Center, Rochester, New York More articles by this author , FengChangyong Feng...

10.1016/j.juro.2017.07.037 article EN The Journal of Urology 2017-07-18

Abstract Background: Most studies examining the prognostic value of preoperative coagulation testing are too small to examine predictive routine in patients having noncardiac surgery. Methods: Using data from American College Surgeons National Surgical Quality Improvement database, authors performed a retrospective observational study on 316,644 surgery who did not have clinical indications for testing. The used multivariable logistic regression analysis explore association between platelet...

10.1097/aln.0b013e3182a4441f article EN Anesthesiology 2013-07-31
Wojciech Zaręba James P. Daubert Christopher A. Beck David T. Huang Jeffrey D. Alexis and 95 more Mary W. Brown Kathryn Pyykkonen Scott McNitt David Oakes Changyong Feng Mehmet K. Aktaş Felix Ayala-Parades Adrián Baranchuk Marc Dubuc Mark C. Haigney Alexander Mazur Craig A. McPherson L. Brent Mitchell Andrea Natale Jonathan P. Piccini Merritt H. Raitt Mayer Rashtian Claudio Schuger Stephen L. Winters Seth J. Worley Ohad Ziv Arthur J. Moss Wojciech Zaręba Kathryn Pyykkonen April Buttaccio Elizabeth L. Perkins D. DeGrey Steven S. Robertson Alastair J. Moss Mary W. Brown Ramona Lansing A. Oberer Bronislava Polonsky V. Ross Anna Papernov Susan Schleede Christopher A. Beck David Oakes Changyong Feng S. McNitt S William J. Hall Wojciech Zaręba Alastair J. Moss James P. Daubert Christopher A. Beck Mary W. Brown David T. Huang S. Winters Claudio Schuger Mark C. Haigney Jonathan P. Piccini Jeffrey D. Alexis L. Chen Anthony B. Miller J. Franklin Richeson Spencer Rosero David T. Huang Valentina Kutyifa Ahmed A Shah Gervasio A. Lamas F. Cohn Frank E. Harrell Ileana L. Piña Jo Poole Michael Sullivan David A. Lathrop Nancy L. Geller Robin Boineau J. Trondell Leslie Cooper E. Itturiaga Robin Boineau Charles Gottlieb Stephen Greer Christian Perzanowski Craig A. McPherson Chester M. Hedgepeth Chafik Assal Tariq Salam Ian Woollett Gery Tomassoni Félix Ayala-Paredes Andrea M. Russo Sujeeth R. Punnam Robert Sangrigoli Sarah Sloan Steven P. Kutalek Jonathan P. Piccini A. Sun Daniel L. Lustgarten George Monir Daniel Haithcock Raffaella Sorrentino David S. Cannom Jeffery Kluger

Ventricular tachycardia (VT) and ventricular fibrillation (VF) remain a challenging problem in patients with implantable cardioverter-defibrillators (ICDs).This study aimed to determine whether ranolazine administration decreases the likelihood of VT, VF, or death an ICD.This was double-blind, placebo-controlled clinical trial which high-risk ICD ischemic nonischemic cardiomyopathy were randomized 1,000 mg twice day placebo. The primary endpoint VT VF requiring appropriate therapy death,...

10.1016/j.jacc.2018.04.086 article EN cc-by-nc-nd Journal of the American College of Cardiology 2018-07-30

There is a dearth of studies that have compared clinical and radiologic markers periodontal inflammation between water-pipe smokers (WPs) cigarette (CSs). The aim the present study to compare radiographic status habitual WPs CSs.In total, 200 males (50 WPs, 50 CSs, 100 controls) with comparable mean age education were included. Demographic information was recorded using questionnaire. Periodontal parameters (plaque index [PI], bleeding on probing [BOP], depth [PD], attachment loss [AL],...

10.1902/jop.2015.150235 article EN Journal of Periodontology 2015-10-02

The restriction of resident hours with an increasing focus on patient safety and a reduced caseload has impacted surgical training. A complex complication prone procedure such as percutaneous nephrolithotomy (PCNL) steep learning curve may create unsafe environment for hands-on In this study, we validate high fidelity, inanimate PCNL model within full-immersion simulation environment.Anatomically correct models the human pelvicaliceal system, kidney, relevant adjacent structures were created...

10.1089/end.2017.0366 article EN Journal of Endourology 2017-10-19

Logistic regression is a popular statistical method in studying the effects of covariates on binary outcomes. It has been widely used both clinical trials and observational studies. However, results from univariate multiple logistic tend to be conflicting. A covariate may show very strong effect outcome but not regression, vice versa. These facts have well appreciated biomedical research. Misuse prevalent medical publications. In this paper, we study inconsistency between regressions give...

10.11919/j.issn.1002-0829.217031 article EN PubMed 2017-04-25
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