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Threshold Regression

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https://www.readbyqxmd.com/read/27922539/effect-of-tomographic-operator-inaccuracies-and-respiratory-motion-on-pet-ct-lung-nodule-images-smearing
#1
Joël Daouk, Pascal Bailly, Roger Bouzerar, Marc-Étienne Meyer
BACKGROUND: In thoracic PET/computed tomography (CT) imaging, uptake foci usually appear smeared because of postreconstruction smoothing and respiratory motion. OBJECTIVE: The aim of the present study was to assess the respective contributions of the reconstruction process and respiratory motion on PET/CT images. MATERIALS AND METHODS: Thirty-one pulmonary lesions were studied. Free-breathing PET/CT acquisitions were followed by a 10-min respiratory-gated PET/CT acquisition...
December 2, 2016: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/27920131/maternal-urinary-bisphenol-a-concentration-during-midterm-pregnancy-and-children-s-blood-pressure-at-age-4
#2
Sanghyuk Bae, Youn-Hee Lim, Young Ah Lee, Choong Ho Shin, Se-Young Oh, Yun-Chul Hong
Bisphenol A (BPA) has been reported to be associated with adverse health effects, including high blood pressure (BP). BPA is also suspected to cross placenta in pregnancy and might affect children's health. The present study was aimed to evaluate the effect of prenatal exposure to BPA on the BP of the child at the age of 4. We followed up 645 children at the age of 4 who were born from women who participated midterm during their pregnancy in a birth cohort study from August 2008 to July 2011. Because BPA and BP showed nonlinear association, we constructed a piecewise regression model to examine the association between urinary BPA concentration of mother at around 20 weeks of gestation and BP of the child at age 4 and to determine threshold level of BPA for the association...
December 5, 2016: Hypertension
https://www.readbyqxmd.com/read/27919934/development-and-validation-of-risk-prediction-model-for-venous-thromboembolism-in-postpartum-women-multinational-cohort-study
#3
Alyshah Abdul Sultan, Joe West, Matthew J Grainge, Richard D Riley, Laila J Tata, Olof Stephansson, Kate M Fleming, Catherine Nelson-Piercy, Jonas F Ludvigsson
OBJECTIVE:  To develop and validate a risk prediction model for venous thromboembolism in the first six weeks after delivery (early postpartum). DESIGN:  Cohort study. SETTING:  Records from England based Clinical Practice Research Datalink (CPRD) linked to Hospital Episode Statistics (HES) and data from Sweden based registry. PARTICIPANTS:  All pregnant women registered with CPRD-HES linked data between 1997 and 2014 and Swedish medical birth registry between 2005 and 2011 with postpartum follow-up...
December 5, 2016: BMJ: British Medical Journal
https://www.readbyqxmd.com/read/27919234/blended-cbt-versus-face-to-face-cbt-a-randomised-non-inferiority-trial
#4
Kim Mathiasen, Tonny E Andersen, Heleen Riper, Annet A M Kleiboer, Kirsten K Roessler
BACKGROUND: Internet based cognitive behavioural therapy (iCBT) has been demonstrated to be cost- and clinically effective. There is a need, however, for increased therapist contact for some patient groups. Combining iCBT with traditional face-to-face (ftf) consultations in a blended format (B-CBT) may produce a new treatment format with multiple benefits from both traditional CBT and iCBT such as individual adaptation, lower costs than traditional therapy, wide geographical and temporal availability, and possibly lower threshold to implementation...
December 5, 2016: BMC Psychiatry
https://www.readbyqxmd.com/read/27916426/high-body-mass-index-in-infancy-may-predict-severe-obesity-in-early-childhood
#5
Allison Smego, Jessica G Woo, Jillian Klein, Christina Suh, Danesh Bansal, Sherri Bliss, Stephen R Daniels, Christopher Bolling, Nancy A Crimmins
OBJECTIVE: To characterize growth trajectories of children who develop severe obesity by age 6 years and identify clinical thresholds for detection of high-risk children before the onset of obesity. STUDY DESIGN: Two lean (body mass index [BMI] 5th to ≤75th percentile) and 2 severely obese (BMI ≥99th percentile) groups were selected from populations treated at pediatric referral and primary care clinics. A population-based cohort was used to validate the utility of identified risk thresholds...
December 2, 2016: Journal of Pediatrics
https://www.readbyqxmd.com/read/27916197/peak-creatinine-kinase-level-is-a-key-adjunct-in-the-evaluation-of-critically-ill-trauma-patients
#6
Saskya Byerly, Elizabeth Benjamin, Subarna Biswas, Jayun Cho, Eugene Wang, Monica D Wong, Kenji Inaba, Demetrios Demetriades
BACKGROUND: Elevated creatinine kinase (CK) can indicate rhabdomyolysis, a risk factor for acute kidney injury (AKI). We investigated risk factors and clinical significance of peak CK levels. METHODS: Retrospective analysis, adult trauma patients. Logistic regression was used to identify risk factors for elevated CK and AKI. RESULTS: 3240 trauma patients were analyzed; median time to peak CK was 17 h and 347 patients had peak CK > 5000...
November 24, 2016: American Journal of Surgery
https://www.readbyqxmd.com/read/27915052/massive-localized-lymphedema-a-case-control-study
#7
Reid Maclellan, David Zurakowski, Frederick D Grant, Arin K Greene
BACKGROUND: Massive localized lymphedema (MLL) is an area of skin and subcutaneous overgrowth associated with obesity. The purpose of this project was to determine whether MLL results from obesity-induced lymphedema (OIL), and to characterize the prevalence and risk factors for the condition. STUDY DESIGN: Patients evaluated in our Lymphedema Program between 2009 and 2016 were reviewed for obese individuals [body mass index (BMI) > 30 kg/m(2)] who had lower extremity lymphatic function evaluated by lymphoscintigraphy...
November 10, 2016: Journal of the American College of Surgeons
https://www.readbyqxmd.com/read/27912169/non-harmonicity-in-high-frequency-components-of-the-intra-operative-corticogram-to-delineate-epileptogenic-tissue-during-surgery
#8
Evelien E Geertsema, Maryse A van 't Klooster, Nicole E C van Klink, Frans S S Leijten, Peter C van Rijen, Gerhard H Visser, Stiliyan N Kalitzin, Maeike Zijlmans
OBJECTIVE: We aimed to test the potential of auto-regressive model residual modulation (ARRm), an artefact-insensitive method based on non-harmonicity of the high-frequency signal, to identify epileptogenic tissue during surgery. METHODS: Intra-operative electrocorticography (ECoG) of 54 patients with refractory focal epilepsy were recorded pre- and post-resection at 2048Hz. The ARRm was calculated in one-minute epochs in which high-frequency oscillations (HFOs; fast ripples, 250-500Hz; ripples, 80-250Hz) and spikes were marked...
November 17, 2016: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/27912129/incidence-of-complications-in-young-onset-diabetes-comparing-type-2-with-type-1-the-young-diab-study
#9
Anandakumar Amutha, Ranjit Mohan Anjana, Ulagamathesan Venkatesan, Harish Ranjani, Ranjit Unnikrishnan, K M Venkat Narayan, Viswanathan Mohan, Mohammed K Ali
BACKGROUND: There is little data on the incidence of diabetes complications in young onset type 1 diabetes (T1DM) and type 2 diabetes (T2DM) in non European populations. METHODS: From a tertiary diabetes centre, Chennai, India, we recruited 108 T1DM (defined by abrupt onset of symptoms or diabetic ketoacidosis, absent insulin reserve requiring insulin treatment) and 90 T2DM participants (defined by absence of ketosis, good beta-cell reserve, and good response to oral agents) who were diagnosed between the ages of 10 and 25years, and without any evidence of diabetes complications at diagnosis...
November 17, 2016: Diabetes Research and Clinical Practice
https://www.readbyqxmd.com/read/27909753/six-minute-walk-test-as-a-predictor-for-outcome-in-children-with-dilated-cardiomyopathy-and-chronic-stable-heart-failure
#10
Susanna L den Boer, Daniël H K Flipse, Marijke H van der Meulen, Ad P C M Backx, Gideon J du Marchie Sarvaas, Arend D J Ten Harkel, Gabriëlle G van Iperen, Lukas A J Rammeloo, Ronald B Tanke, Willem A Helbing, Tim Takken, Michiel Dalinghaus
Cardiopulmonary exercise testing is an important tool to predict prognosis in children and adults with heart failure. A much less sophisticated exercise test is the 6 min walk test, which has been shown an independent predictor for morbidity and mortality in adults with heart failure. Therefore, we hypothesized that the 6 min walk test could be predictive for outcome in children with dilated cardiomyopathy. We prospectively included 49 children with dilated cardiomyopathy ≥6 years who performed a 6 min walk test...
December 1, 2016: Pediatric Cardiology
https://www.readbyqxmd.com/read/27905829/post-traumatic-stress-disorder-dimensions-and-asthma-morbidity-in-world-trade-center-rescue-and-recovery-workers
#11
Irina Mindlis, Esperanza Morales-Raveendran, Emily Goodman, Kevin Xu, Clara Vila-Castelar, Kristine Keller, Ginger Crawford, Shynah James, Craig Katz, Laura E Crowley, Rafael E de la Hoz, Steven Markowitz, Juan P Wisnivesky
Objective Using data from a cohort of World Trade Center (WTC) rescue and recovery workers with asthma, we assessed whether meeting criteria for post-traumatic stress disorder (PTSD), sub- PTSD and for specific PTSD symptom dimensions are associated with increased asthma morbidity. Methods Participants underwent a Structured Clinical Interview for Diagnostic and Statistical Manual to assess presence of PTSD following DSM-IV criteria during in-person interviews between December 2013 and April 2015. We defined sub-threshold PTSD as meeting criteria for two of three symptom dimensions: re-experiencing, avoidance, or hyper-arousal...
December 1, 2016: Journal of Asthma: Official Journal of the Association for the Care of Asthma
https://www.readbyqxmd.com/read/27905501/using-baidu-search-index-to-predict-dengue-outbreak-in-china
#12
Kangkang Liu, Tao Wang, Zhicong Yang, Xiaodong Huang, Gabriel J Milinovich, Yi Lu, Qinlong Jing, Yao Xia, Zhengyang Zhao, Yang Yang, Shilu Tong, Wenbiao Hu, Jiahai Lu
This study identified the possible threshold to predict dengue fever (DF) outbreaks using Baidu Search Index (BSI). Time-series classification and regression tree models based on BSI were used to develop a predictive model for DF outbreak in Guangzhou and Zhongshan, China. In the regression tree models, the mean autochthonous DF incidence rate increased approximately 30-fold in Guangzhou when the weekly BSI for DF at the lagged moving average of 1-3 weeks was more than 382. When the weekly BSI for DF at the lagged moving average of 1-5 weeks was more than 91...
December 1, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27904923/can-diffusion-weighted-magnetic-resonance-imaging-of-clear-cell-renal-carcinoma-predict-low-from-high-nuclear-grade-tumors
#13
Carolina Parada Villavicencio, Robert J Mc Carthy, Frank H Miller
OBJECTIVE: To assess the diagnostic performance of the apparent diffusion coefficient (ADC) in predicting the Fuhrman nuclear grading of clear cell renal cell carcinomas (ccRCC). MATERIALS AND METHODS: A total of 129 patients who underwent partial and radical nephrectomies with pathology-proven ccRCC were retrospectively evaluated. Histopathological characteristics and nuclear grades were analyzed. In addition, conventional magnetic resonance imaging (MRI) features were assessed in consensus by two radiologists to discriminate nuclear grading...
December 1, 2016: Abdominal Radiology
https://www.readbyqxmd.com/read/27903592/alpha-angle-measurements-in-healthy-adult-volunteers-vary-depending-on-the-mri-plane-acquisition-used
#14
Mohammad Golfam, Luigia A Di Primio, Paul E Beaulé, Kalesha Hack, Mark E Schweitzer
BACKGROUND: It has been shown that cam deformities are located at a more anterosuperior location than was previously described. PURPOSE: To establish, in a large group of asymptomatic participants, the normative range of the alpha angle in the anterosuperior location in both the oblique axial and radial views of magnetic resonance imaging (MRI). STUDY DESIGN: Cross-sectional study; Level of evidence, 3. METHODS: In 197 asymptomatic participants (394 asymptomatic hips) with a mean age of 29...
November 9, 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/27903012/-shift-work-among-men-and-women-on-the-threshold-to-higher-working-age-working-conditions-and-health-status
#15
C Leser, A Tisch, S Tophoven
Background: The number of older employees in shift and night work has increased significantly in recent years. Furthermore, the proportion of women in shift and night work has increased markedly. This is due to the aging workforce and the expansion of shift work in the tertiary sector. Previous research shows that shift work is often associated with health risks. Against this background, the aim of the present study is to examine the situation of working men and women on the threshold to higher working age with regard to the relationship between shift work and physical health...
November 2016: Das Gesundheitswesen
https://www.readbyqxmd.com/read/27900795/deferral-for-low-hemoglobin-is-not-associated-with-increased-risk-of-infection-in-danish-blood-donors
#16
Sebastian R Kotzé, Ole B Pedersen, Mikkel S Petersen, Erik Sørensen, Khoa Manh Dinh, Kathrine Agergård Kaspersen, Andreas S Rigas, Henrik Hjalgrim, Klaus Rostgaard, Gustaf Edgren, Henrik Ullum, Christian Erikstrup
BACKGROUND: Low hemoglobin (Hb) is associated with poor general health and adverse outcomes in a wide range of diseases. However, a link between Hb levels and the risk of infection among healthy individuals has yet to be investigated. STUDY DESIGN AND METHODS: Using data from the Scandinavian Donations and Transfusions database, 497,390 donors were followed after 5,458,499 donations in health registers. With 1,339,362 person-years of follow-up, Andersen-Gill Cox regression was used to study the association of Hb levels below deferral thresholds, very low Hb levels (in the lowest 0...
November 29, 2016: Transfusion
https://www.readbyqxmd.com/read/27900214/are-magnetic-resonance-imaging-undetectable-prostate-tumours-clinically-significant-results-of-histopathological-analyses
#17
Kristian D Stensland, Karl Coutinho, Adele R Hobbs, Lindsay Haines, Shemille A Collingwood, Young Suk Kwon, Simon J Hall, Maria Katsigeorgis, Seyed Behzad Jazayeri, David B Samadi
OBJECTIVE: To investigate whether tumours at threshold values for detection on magnetic resonance imaging (MRI) represent clinically significant tumours or not, and therefore the utility of MRI in active surveillance (AS) protocols. PATIENTS AND METHODS: A retrospective analysis of a single institution database was performed after Institutional Review Board approval. Between 2010 and 2013, 1633 patients underwent robot-assisted laparoscopic prostatectomy (RALP) at a single institution by a single surgeon...
December 2016: Arab Journal of Urology
https://www.readbyqxmd.com/read/27898949/modeling-response-to-heat-stress-in-pigs-from-nucleus-and-commercial-farms-in-different-locations-in-the-united-states
#18
B O Fragomeni, D A L Lourenco, S Tsuruta, S Andonov, K Gray, Y Huang, I Misztal
The purpose of this study was to analyze the impact of seasonal losses due to heat stress in different environments and genetic group combinations. Data were available for 2 different swine populations: purebred Duroc animals raised in nucleus farms in Texas and North Carolina and crosses of Duroc and F females (Landrace × Large White) raised in commercial farms in Missouri and North Carolina; pedigrees provided links between animals from different states. Traits included BW at harvest age for purebred animals and HCW for crossbred animals...
November 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27898643/effect-of-different-osmolalities-cho-types-and-cho-on-gastric-emptying-in-humans
#19
Xiaocai Shi, Kristin L Osterberg, Heather Petrie, John R Stofan, Robert Murray
PURPOSE: This study investigated the effect of beverage osmolalities, carbohydrate (CHO) type and CHO concentration on gastric emptying in euhydrated subjects at rest. METHODS: The gastric emptying of water (W), four glucose beverages (2, 4, 6, and 8% glucose: 2G, 4G, 6G, and 8G) and four sucrose beverages (2, 4, 6, and 8% sucrose: 2S, 4S, 6S, and 8S) were determined in eight healthy subjects using the modified George double-sampling technique. Subjects ingested a beverage (7 ml/kg body weight) containing 25-ppm phenol red as quickly as possible (≤1...
November 28, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27898387/a-novel-adaboost-framework-with-robust-threshold-and-structural-optimization
#20
Peng-Bo Zhang, Zhi-Xin Yang
The AdaBoost algorithm is a popular ensemble method that combines several weak learners to boost generalization performance. However, conventional AdaBoost.RT algorithms suffer from the limitation that the threshold value must be manually specified rather than chosen through a self-adaptive mechanism, which cannot guarantee a result in an optimal model for general cases. In this paper, we present a generic AdaBoost framework with robust threshold mechanism and structural optimization on regression problems...
November 24, 2016: IEEE Transactions on Cybernetics
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