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Munsch G, Proust C, Labrouche-Colomer S, Aïssi D, Boland A, Morange PE, Roche A, de Chaisemartin L, Harroche A, Olaso R, Deleuze JF, James C, Emmerich J, Smadja DM, Jacqmin-Gadda H, Trégouët DA. Genome-wide association study of a semicontinuous trait: illustration of the impact of the modeling strategy through the study of Neutrophil Extracellular Traps levels. NAR Genom Bioinform 2023; 5:lqad062. [PMID: 37388819 PMCID: PMC10304785 DOI: 10.1093/nargab/lqad062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 05/10/2023] [Accepted: 06/07/2023] [Indexed: 07/01/2023] Open
Abstract
Over the last years, there has been a considerable expansion of genome-wide association studies (GWAS) for discovering biological pathways underlying pathological conditions or disease biomarkers. These GWAS are often limited to binary or quantitative traits analyzed through linear or logistic models, respectively. In some situations, the distribution of the outcome may require more complex modeling, such as when the outcome exhibits a semicontinuous distribution characterized by an excess of zero values followed by a non-negative and right-skewed distribution. We here investigate three different modeling for semicontinuous data: Tobit, Negative Binomial and Compound Poisson-Gamma. Using both simulated data and a real GWAS on Neutrophil Extracellular Traps (NETs), an emerging biomarker in immuno-thrombosis, we demonstrate that Compound Poisson-Gamma was the most robust model with respect to low allele frequencies and outliers. This model further identified the MIR155HG locus as significantly (P = 1.4 × 10-8) associated with NETs plasma levels in a sample of 657 participants, a locus recently highlighted to be involved in NETs formation in mice. This work highlights the importance of the modeling strategy for GWAS of a semicontinuous outcome and suggests Compound Poisson-Gamma as an elegant but neglected alternative to Negative Binomial for modeling semicontinuous outcome in the context of genomic investigations.
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Affiliation(s)
| | - Carole Proust
- Univ. Bordeaux, Inserm, Bordeaux Population Health Research Center, UMR 1219, F-33000 Bordeaux, France
| | - Sylvie Labrouche-Colomer
- UMR1034, Inserm, Biology of Cardiovascular Diseases, University of Bordeaux, Pessac, France
- Laboratoire d’Hématologie, CHU de Bordeaux, Pessac, France
| | - Dylan Aïssi
- Univ. Bordeaux, Inserm, Bordeaux Population Health Research Center, UMR 1219, F-33000 Bordeaux, France
| | - Anne Boland
- Université Paris-Saclay, CEA, Centre National de Recherche en Génomique Humaine (CNRGH), 91057 Evry, France
| | - Pierre-Emmanuel Morange
- Cardiovascular and Nutrition Research Center (C2VN), INSERM, INRAE, Aix-Marseille University, Marseille, France
| | - Anne Roche
- Service pneumologie hôpital Bicêtre, France
| | - Luc de Chaisemartin
- Service Auto-immunité, Hypersensibilité et Biothérapies, Hôpital Bichat, Assistance Publique-Hôpitaux de Paris, Paris, France
- Université Paris-Saclay, INSERM, Inflammation, Microbiome, Immunosurveillance, Orsay, France
| | - Annie Harroche
- Service d’Hématologie Clinique Centre de Traitement de l’Hémophilie Hôpital Necker Enfants Malades, France
| | - Robert Olaso
- Université Paris-Saclay, CEA, Centre National de Recherche en Génomique Humaine (CNRGH), 91057 Evry, France
- Centre d’Etude du Polymorphisme Humain, Fondation Jean Dausset, Paris, France
| | - Jean-François Deleuze
- Université Paris-Saclay, CEA, Centre National de Recherche en Génomique Humaine (CNRGH), 91057 Evry, France
- Centre d’Etude du Polymorphisme Humain, Fondation Jean Dausset, Paris, France
| | - Chloé James
- UMR1034, Inserm, Biology of Cardiovascular Diseases, University of Bordeaux, Pessac, France
- Laboratoire d’Hématologie, CHU de Bordeaux, Pessac, France
| | - Joseph Emmerich
- Department of vascular medicine, Paris Saint-Joseph Hospital Group, University of Paris, UMR1153, INSERM, CRESS, 185 rue Raymond Losserand, Cité, 75674, France
| | - David M Smadja
- Innovative Therapies in Hemostasis, Université de Paris, INSERM, F-75006 Paris, France
- Hematology Department and Biosurgical Research Lab (Carpentier Foundation), Assistance Publique Hôpitaux de Paris, Centre-Université de Paris (APHP-CUP), F-75015 Paris, France
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Wang X, Li M, Sun W, Gao Z, Li X. Confidence intervals for zero-inflated gamma distribution. COMMUN STAT-SIMUL C 2022. [DOI: 10.1080/03610918.2022.2104315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Xiao Wang
- School of Mathematics and Statistics, Qingdao University, Qingdao, China
- Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing, China
| | - Min Li
- School of Mathematics and Statistics, Qingdao University, Qingdao, China
| | - Weina Sun
- School of Mathematics and Statistics, Qingdao University, Qingdao, China
| | - Zheng Gao
- Department of Economics, University of Bristol, Bristol, UK
| | - Xinmin Li
- School of Mathematics and Statistics, Qingdao University, Qingdao, China
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Tweedie Model for Predicting Factors Associated with Distance Traveled to Access Inpatient Services in Kenya. JOURNAL OF PROBABILITY AND STATISTICS 2022. [DOI: 10.1155/2022/2706504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Aim. This study aims to examine which factors influence the distance traveled by patients for inpatient care in Kenya. Methods. We used data from the fourth round of the Kenya Household Health Expenditure and Utilization survey. Our dependent variable was the self-reported distance traveled by patients to access inpatient care at public health facilities. As the clustered data were correlated, we used the generalized estimating equations approach with an exchangeable correlation under a Tweedie distribution. To select the best-fit covariates for predicting distance, we adopted a variable selection technique using the
and
criteria, wherein the lowest (highest) value for the former (latter) is preferred. Results. Using data for 451 participants from 47 counties, we found that three-fifths were admitted between 1 and 5 days, two-thirds resided in rural areas, and 90% were satisfied with the facilities’ service. Wealth quintiles were evenly distributed across respondents. Most admissions (81%) comprised
15,
65, and 25–54 years. Many households were of medium size (4–6 members) and had low education level (48%), and nine-tenths had no access to insurance. While two-thirds reported employment-based income, the same number reported not having cash to pay for inpatient services; 6 out of 10 paid over 3000 KES. Thus, differences in employment, ability to pay, and household size influence the distance traveled to access government healthcare facilities in Kenya. Interpretation. Low-income individuals more likely have large households and live in rural areas and, thus, are forced to travel farther to access inpatient care. Unlike the unemployed, the employed may have better socioeconomic status and possibly live near inpatient healthcare facilities, thereby explaining their short distances to access these services. Policymakers must support equal access to inpatient services, prioritize rural areas, open job opportunities, and encourage smaller families.
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Faramiñan A, Rodriguez PO, Carmona F, Holzman M, Rivas R, Mancino C. Estimation of actual evapotranspiration in barley crop through a generalized linear model. MethodsX 2022; 9:101665. [PMID: 35345789 PMCID: PMC8956861 DOI: 10.1016/j.mex.2022.101665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 03/03/2022] [Accepted: 03/06/2022] [Indexed: 11/16/2022] Open
Abstract
Evapotranspiration is a key variable of the water cycle. Its calculation requires several ground data that frequently are not available. This study contains a detailed method and measurements of meteorological and energy balance variables that can be used to estimate the daily actual evapotranspiration (ETa). A linear generalized model is obtained to calculate the ETa from common variables measured in meteorological stations. The method showed a good performance over a barley crop of easthern Argentine Pampas and can be applied and tested in other great plains. Measurements of soil-plant-atmosphere are included The routines to reproduce the method are included The generalized method allows the calculation of daily ETa over crops and was tested over barley crops
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Affiliation(s)
- Adán Faramiñan
- Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Hidrología de Llanuras “Dr. Eduardo J. Usunoff” (IHLLA), Rep. Italia 780, B7300, Azul, Argentina
| | - Paula Olivera Rodriguez
- Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Hidrología de Llanuras “Dr. Eduardo J. Usunoff” (IHLLA), Rep. Italia 780, B7300, Azul, Argentina
| | - Facundo Carmona
- Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Hidrología de Llanuras “Dr. Eduardo J. Usunoff” (IHLLA), Rep. Italia 780, B7300, Azul, Argentina
| | - Mauro Holzman
- Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Hidrología de Llanuras “Dr. Eduardo J. Usunoff” (IHLLA), Rep. Italia 780, B7300, Azul, Argentina
- Corresponding author.
| | - Raúl Rivas
- Comisión de Investigaciones Científicas de la provincia de Buenos Aires, Instituto de Hidrología de Llanuras “Dr. Eduardo J. Usunoff” (IHLLA), Tandil B7000, Argentina
| | - Christian Mancino
- Comisión de Investigaciones Científicas de la provincia de Buenos Aires, Instituto de Hidrología de Llanuras “Dr. Eduardo J. Usunoff” (IHLLA), Tandil B7000, Argentina
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