Search results for " cut-off"

showing 4 items of 4 documents

Rail freight transport and demand requirements : an analysis of attribute cut-offs through a stated preference experiment

2014

This paper analyses the choice between road and rail in Spain where rail market share for freight is still residual. Discrete choice models are estimated with data obtained through a two-phase fieldwork, thus allowing us to carry out a stated preference efficient design for each interviewee. We analyse the existence of attribute cut-offs and the presence of a segment of the population with a zero value of frequency. Our results show that ignoring the existence of cut-offs and segments of the population with polarised valuations can lead to erroneous conclusions in terms of the possibilities of rail for absorbing significant quota.

Economia internacionalRail freight transportPopulation0211 other engineering and technologiesTransportation02 engineering and technologyDevelopmentResidualMicroeconomicsMixed logit0502 economics and businessEconomicsstated preference experimentsMarket shareeducationPreference (economics)Civil and Structural Engineering050210 logistics & transportationeducation.field_of_studyDiscrete choicebusiness.industry05 social sciences021107 urban & regional planningmixed logitattribute cut-offsfootnote Informationfreight transportzero-valuationValue (economics)business
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Swimming pool water--fractionation and genotoxicological characterization of organic constituents.

2005

Swimming pool water treatment in general includes flocculation, sand filtration, and subsequent disinfection with chlorine. The continuous chlorination and input of organic material by bathers in combination with recirculation of the pool water leads to an accumulation of disinfection by-products (DBPs) in the water. Several DBPs have been identified as human carcinogens and are thought to cause allergic asthma. Therefore, the elimination of DBPs is one major aim of pool water treatment. Using membrane filtration as an alternative treatment technology, DBPs can be removed more efficiently than with conventional treatment. In this study membrane filtration and genotoxicity testing were appli…

Environmental Engineeringchemistry.chemical_elementFractionationChemical FractionationMembrane technologylaw.inventionCell LineWater PurificationHalogensSwimming PoolslawDissolved organic carbonChlorineHumansWaste Management and DisposalFiltrationWater Science and TechnologyCivil and Structural EngineeringChromatographyChemistryEcological ModelingWaterPollutionDisinfectionMolecular WeightMembraneWater treatmentAdsorptionComet AssayMolecular weight cut-offFiltrationWater Pollutants ChemicalMutagensWater research
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Definition of fibromyalgia severity: findings from a cross-sectional survey of 2339 Italian patients

2021

Abstract Objective To establish optimal cut-off values for the scores of the revised Fibromyalgia Impact Questionnaire (FIQR), the modified Fibromialgia Assessment Scale (FAS 2019mod), and the Polysymptomatic Distress Scale (PDS) in order to distinguish five levels of FM disease severity. Methods Consecutive FM patients were evaluated with the three clinimetric indices, and each patient was required to answer the anchor question: ‘In general, would you say your health is 1 = very good, 2 = good, 3 = fair, 4 = poor, or 5 = very poor?’—which represented the external criterion. Cut-off points were established through the interquartile reconciliation approach. Results The study sample consisted…

MalePercentileSettore MED/16 - REUMATOLOGIAFibromyalgiaCross-sectional studyseverityDiseaseSeverity of Illness IndexEconomica0302 clinical medicinemodifiedInterquartile rangeRetrospective StudieFibromyalgiaSurveys and QuestionnairesSurveys and QuestionnairePharmacology (medical)030212 general & internal medicinecut-off pointsPain MeasurementFibromyalgia Assessment Status; cut-off points; fibromyalgia; modified; polysymptomatic distress scale; revised Fibromyalgia Impact Questionnaire; severity; Cross-Sectional Studies; Female; Fibromyalgia; Follow-Up Studies; Humans; Incidence; Italy; Male; Middle Aged; Pain Measurement; Prognosis; Retrospective Studies; Severity of Illness Index; Surveys and Questionnaires; Quality of LifeIncidencerevised Fibromyalgia Impact Questionnairecut-off points; fibromyalgia; Fibromyalgia Assessment Status; modified; polysymptomatic distress scale; revised Fibromyalgia Impact Questionnaire; severityMiddle AgedPrognosisDistressItalyFemalefibromyalgiaFibromyalgia Assessment StatusHumanmedicine.medical_specialtyPrognosiRevised Fibromyalgia Impact QuestionnaireFollow-Up Studie03 medical and health sciencesRheumatologyInternal medicineSeverity of illnesscut-off pointmedicineHumansRetrospective Studies030203 arthritis & rheumatologyCross-Sectional Studiebusiness.industrymedicine.diseaseFibromyalgia Assessment StatuCross-Sectional StudiesFibromyalgia; severity; cut-off points; revised Fibromyalgia Impact Questionnaire; modified; Fibromyalgia Assessment Status; polysymptomatic distress scalepolysymptomatic distress scalefibromyalgia assessment status; cut-off points; fibromyalgia; modified; polysymptomatic distress scale; revised fibromyalgia impact questionnaire; severityQuality of LifebusinessFollow-Up Studies
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A model-based approach for assessing bronchodilator responsiveness in children: The conventional cutoff revisited

2020

An increase in FEV1 >=12% has been proposed in international guidelines as a clue to airway reversibility for diagnosing asthma in both adults and children. However, the validity of this cut-off has been questioned in the pediatric population. The aim of this study was to provide evidence that different cut-off values in BDR may be associated with better performance in discriminating among outpatient children with naïve asthma (A) and without asthma (NA). We compared three approaches: i) the conventional cutoff (12%); ii) the cut-off estimated by Youden's criteria; and iii) the cut-off based on a model-driven approach. we found that the conventional cut-off of 12% showed poor sensitivity in…

SpirometryMalePediatricsmedicine.medical_specialtycut-offAdolescentmedicine.drug_classImmunologyspirometrySensitivity and Specificitysegmented modelchildrenReference ValuesBronchodilatorForced Expiratory VolumeImmunology and AllergyMedicineCutoffHumansChildAsthmaModels Statisticalmedicine.diagnostic_testbusiness.industryasthmachildren asthma spirometry bronchodilator response cut-offmedicine.diseaseBronchodilator AgentsChild PreschoolFemalebronchodilator responsedynamic nomogrambusiness
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