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Le Chenadec J, Mayaux MJ, Guihenneuc-Jouyaux C, Blanche S. Perinatal antiretroviral treatment and hematopoiesis in HIV-uninfected infants. AIDS 2003; 17:2053-61. [PMID: 14502008 DOI: 10.1097/00002030-200309260-00006] [Citation(s) in RCA: 120] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND The perinatal prophylactic administration of zidovudine is associated with rapidly reversible macrocytic anemia in infants. However, a recent study suggests that there may be more persistent inhibition of hematopoïetic stem cells. OBJECTIVE To study hematopoiesis in uninfected infants, born to HIV-1 seropositive mothers, including those exposed and those not exposed to perinatal zidovudine alone or in combination. METHODS Longitudinal study, from 0 to 18 months, of hemoglobin, platelets, polynuclear neutrophils, total lymphocytes, and CD4+ and CD8+ lymphocytes in more than 4000 infants of the French Perinatal Study. Modeling of repeated measures and non-linear evolution with age, with models combining natural cubic B-splines and random effects. RESULTS The hemoglobin level was transiently reduced in newborns exposed to zidovudine. Multivariate analysis taking into account age, prematurity, geographical origin, maternal drug use and maternal CD4 cell count, indicated that levels of the three other lineages were slightly lower until age 18 months in exposed than not exposed infants (P < 0.0001 for each lineage). There was a negative relationship between the duration of exposure and each hematological variable. Combinations of antiretroviral treatments were associated with larger decreases than monotherapy up to 15 months of age. Similar, but less pronounced, patterns were found for the CD4+ and CD8+ subpopulations of lymphocytes. CONCLUSIONS Zidovudine administered during the perinatal period may result in a small but significant and durable effect on hematopoïesis up to the age of 18 months.
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120 |
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Guihenneuc-Jouyaux C, Richardson S, Longini IM. Modeling markers of disease progression by a hidden Markov process: application to characterizing CD4 cell decline. Biometrics 2000; 56:733-41. [PMID: 10985209 DOI: 10.1111/j.0006-341x.2000.00733.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Multistate models have been increasingly used to model natural history of many diseases as well as to characterize the follow-up of patients under varied clinical protocols. This modeling allows describing disease evolution, estimating the transition rates, and evaluating the therapy effects on progression. In many cases, the staging is defined on the basis of a discretization of the values of continuous markers (CD4 cell count for HIV application) that are subject to great variability due mainly to short time-scale noise (intraindividual variability) and measurement errors. This led us to formulate a Bayesian hierarchical model where, at a first level, a disease process (Markov model on the true states, which are unobserved) is introduced and, at a second level, the measurement process making the link between the true states and the observed marker values is modeled. This hierarchical formulation allows joint estimation of the parameters of both processes. Estimation of the quantities of interest is performed via stochastic algorithms of the family of Markov chain Monte Carlo methods. The flexibility of this approach is illustrated by analyzing the CD4 data on HIV patients of the Concorde clinical trial.
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53 |
3
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Truong T, Rougier Y, Dubourdieu D, Guihenneuc-Jouyaux C, Orsi L, Hémon D, Guénel P. Time trends and geographic variations for thyroid cancer in New Caledonia, a very high incidence area (1985-1999). Eur J Cancer Prev 2007; 16:62-70. [PMID: 17220706 DOI: 10.1097/01.cej.0000236244.32995.e1] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Thyroid cancer incidence in New Caledonia is the highest reported in the world and is approximately 10-fold higher than in most developed countries. We describe the incidence patterns in this country according to histological and sociodemographic characteristics to give clues about potential etiologic factors. Another objective is to see whether the incidence figures are related to enhanced detection of small size carcinomas. The study included all 498 cases of thyroid cancer diagnosed in 1985-1999. Pathology reports were systematically reviewed to determine the histological type of the tumor and the size of the cancerous nodules. The incidence of carcinomas < or =10 mm was taken as an indicator of enhanced detection due to improved screening procedures. The age-standardized incidence rates in 1985-1999 were exceptionally high in Melanesian women (71.4/100,000) and men (10.4/100,000). The incidence increased three-fold in women from 1995 onwards. The increase in incidence was more striking for papillary carcinomas < or =10 mm than for large size carcinomas, but an increased incidence of carcinomas >10 mm was also observed among women. The analysis by municipality of residence in Melanesian women showed that the incidence was twice as high in 1995-1999 in the Loyalty Islands as in the rest of the country. The sharp increase of thyroid cancer incidence in 1985-1999 in New Caledonia was partly related to enhanced detection of small size carcinomas. The elevated incidence of thyroid cancers, as well as the ethnic and geographic disparities, may result from common environmental or lifestyle risk factors that need to be identified.
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Antó JM, Pinart M, Akdis M, Auffray C, Bachert C, Basagaña X, Carlsen KH, Guerra S, von Hertzen L, Illi S, Kauffmann F, Keil T, Kiley JP, Koppelman GH, Lupinek C, Martinez FD, Nawijn MC, Postma DS, Siroux V, Smit HA, Sterk PJ, Sunyer J, Valenta R, Valverde S, Akdis CA, Annesi-Maesano I, Ballester F, Benet M, Cambon-Thomsen A, Chatzi L, Coquet J, Demoly P, Gan W, Garcia-Aymerich J, Gimeno-Santos E, Guihenneuc-Jouyaux C, Haahtela T, Heinrich J, Herr M, Hohmann C, Jacquemin B, Just J, Kerkhof M, Kogevinas M, Kowalski ML, Lambrecht BN, Lau S, Lødrup Carlsen KC, Maier D, Momas I, Noel P, Oddie S, Palkonen S, Pin I, Porta D, Punturieri A, Rancière F, Smith RA, Stanic B, Stein RT, van de Veen W, van Oosterhout AJM, Varraso R, Wickman M, Wijmenga C, Wright J, Yaman G, Zuberbier T, Bousquet J. Understanding the complexity of IgE-related phenotypes from childhood to young adulthood: a Mechanisms of the Development of Allergy (MeDALL) seminar. J Allergy Clin Immunol 2012; 129:943-54.e4. [PMID: 22386796 DOI: 10.1016/j.jaci.2012.01.047] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2011] [Revised: 12/22/2011] [Accepted: 01/12/2012] [Indexed: 12/18/2022]
Abstract
Mechanisms of the Development of Allergy (MeDALL), a Seventh Framework Program European Union project, aims to generate novel knowledge on the mechanisms of initiation of allergy. Precise phenotypes of IgE-mediated allergic diseases will be defined in MeDALL. As part of MeDALL, a scientific seminar was held on January 24, 2011, to review current knowledge on the IgE-related phenotypes and to explore how a multidisciplinary effort could result in a new integrative translational approach. This article provides a summary of the meeting. It develops challenges in IgE-related phenotypes and new clinical and epidemiologic approaches to the investigation of allergic phenotypes, including cluster analysis, scale-free models, candidate biomarkers, and IgE microarrays; the particular case of severe asthma was reviewed. Then novel approaches to the IgE-associated phenotypes are reviewed from the individual mechanisms to the systems, including epigenetics, human in vitro immunology, systems biology, and animal models. The last chapter deals with the understanding of the population-based IgE-associated phenotypes in children and adolescents, including age effect in terms of maturation, observed effects of early-life exposures and shift of focus from early life to pregnancy, gene-environment interactions, cohort effects, and time trends in patients with allergic diseases. This review helps to define phenotypes of allergic diseases in MeDALL.
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Review |
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48 |
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Blanchard P, Hill C, Guihenneuc-Jouyaux C, Baey C, Bourhis J, Pignon JP. Mixed treatment comparison meta-analysis of altered fractionated radiotherapy and chemotherapy in head and neck cancer. J Clin Epidemiol 2011; 64:985-92. [DOI: 10.1016/j.jclinepi.2010.10.016] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2009] [Revised: 09/30/2010] [Accepted: 10/29/2010] [Indexed: 12/16/2022]
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14 |
45 |
6
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Viet AF, Fourichon C, Seegers H, Jacob C, Guihenneuc-Jouyaux C. A model of the spread of the bovine viral-diarrhoea virus within a dairy herd. Prev Vet Med 2004; 63:211-36. [PMID: 15158572 DOI: 10.1016/j.prevetmed.2004.01.015] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2003] [Revised: 01/05/2004] [Accepted: 01/31/2004] [Indexed: 10/26/2022]
Abstract
Wet BVDSim (a stochastic simulation model) was developed to study the dynamics of the spread of the bovine viral-diarrhoea virus (BVDV) within a dairy herd. This model took into account herd-management factors (common in several countries), which influence BVDV spread. BVDSim was designed as a discrete-entity and discrete-event simulation model. It relied on two processes defined at the individual-animal level, with interactions. The first process was a semi-Markov process and modelled the herd structure and dynamics (demography, herd management). The second process was a Markov process and modelled horizontal and vertical virus transmission. Because the horizontal transmission occurs by contacts (nose-to-nose) and indirectly, transmission varied with the separation of animals into subgroups. Vertical transmission resulted in birth of persistently infected (PI) calves. Other possible consequences of a BVDV infection during the pregnancy period were considered (pregnancy loss, immunity of calves). The outcomes of infection were modelled according to the stage of pregnancy at time of infection. BVDV pregnancy loss was followed either by culling or by a new artificial insemination depending on the modelled farmer's decision. Consistency of the herd dynamics in the absence of any BVDV infection was verified. To explore the model behaviour, the virus spread was simulated over 10 years after the introduction of a near-calving PI heifer into a susceptible 38 cow herd. Different dynamics of the virus spread were simulated, from early clearance to persistence of the virus 10 years after its introduction. Sensitivity of the model to the uncertainty on transmission coefficient was analysed. Qualitative validation consisted in comparing the bulk-milk ELISA results over time in a sample of herds detected with a new infection with the ones derived from simulations.
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Abstract
This paper is centred on studies commonly known as ecological studies, where one seeks to estimate risks from data aggregated on a geographical basis. The aggregated nature of the data creates difficulties for interpreting, at an individual level, any ecological association found, difficulties which are generically referred to as 'the ecological bias or fallacy'. Here, we address an important component of this bias related to the problem of misspecification in ecological studies. We consider how aggregated level dose-response relationships are derived from integrating individual level ones over the group, and how their correct specification requires, in general, knowledge of the within-group joint distribution of the relevant risk factors, which is rarely available. We discuss in detail the common situation where data on the proportion of persons exposed in each area to several dichotomous risk factors are available. We show that ecological regression estimates of the relative risk for each factor will be improved by including in the regression, besides the linear terms, cross-product terms of the marginal prevalences. Results from a simulation study are discussed and an example concerning the geographical analysis of lung cancer mortality in France is presented.
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31 |
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Roda C, Kousignian I, Guihenneuc-Jouyaux C, Dassonville C, Nicolis I, Just J, Momas I. Formaldehyde exposure and lower respiratory infections in infants: findings from the PARIS cohort study. ENVIRONMENTAL HEALTH PERSPECTIVES 2011; 119:1653-8. [PMID: 21810553 PMCID: PMC3226490 DOI: 10.1289/ehp.1003222] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2010] [Accepted: 08/02/2011] [Indexed: 05/07/2023]
Abstract
BACKGROUND Certain chemical pollutants can exacerbate lower respiratory tract infections (LRIs), a common childhood ailment. Although formaldehyde (FA) is one of the most common air pollutants found in indoor environments, its impact on infant health is uncertain. OBJECTIVE Our aim was to determine the impact of FA exposure on the LRI incidence during the first year of life of infants from the Pollution and Asthma Risk: an Infant Study (PARIS) birth cohort. METHODS FA was measured in a random sample of 196 infants' dwellings, and exposure to this pollutant was estimated for 2,940 infants using predictive models based on measurements and data about potential determinants of FA levels. Health data were collected from parents by regular self-administered questionnaires. We used multivariate logistic regressions to estimate associations between FA exposure and the occurrence of LRI and wheezy LRI (wLRI), adjusting for potential confounders/risk factors. RESULTS During the first year of life, 45.8% of infants had at least one LRI, and LRI occurred simultaneously with wheezing in 48.7% of cases. The FA predictive models correctly classified 70% of dwellings as having high or low exposure, and we estimated that 43.3% of infants were exposed throughout the first year to levels of FA > 19.5 µg/m3. FA exposure was significantly associated with LRI and wLRI before and after adjustment for known LRI risk factors/confounders. For an interquartile increase in FA levels (12.4 μg/m3), we estimated a 32% [95% confidence interval (CI): 11, 55] and 41% (95% CI: 14, 74) increase in the incidence of LRI and wLRI, respectively. CONCLUSION The findings of this study suggest that infants exposed to FA at an early age have an increased incidence of LRI.
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research-article |
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Bachelet D, Truong T, Verner MA, Arveux P, Kerbrat P, Charlier C, Guihenneuc-Jouyaux C, Guénel P. Determinants of serum concentrations of 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene and polychlorinated biphenyls among French women in the CECILE study. ENVIRONMENTAL RESEARCH 2011; 111:861-70. [PMID: 21684540 DOI: 10.1016/j.envres.2011.06.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2010] [Revised: 05/31/2011] [Accepted: 06/01/2011] [Indexed: 05/26/2023]
Abstract
BACKGROUND Dichlorodiphenyltrichloroethane (DDT) and polychlorinated biphenyls (PCBs) are persistent organochlorine compounds bioaccumulating in human tissues. Body burden of organochlorines may be influenced by individual characteristics such as age, weight variations, breastfeeding, dietary habits and place of residence. OBJECTIVES To assess the current serum concentrations of 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene (p,p'-DDE), the main DDT breakdown product, and of PCBs in women from two French administrative areas (Ille-et-Vilaine and Côte d'Or). To identify determinants of the current serum levels among individual characteristics related to intake, metabolism, and excretion of organochlorines. METHODS We measured serum p,p'-DDE and PCB levels in 1055 general population women who were recruited in 2005-2007 to serve as controls in a case-control study on breast cancer. Associations between organochlorine levels and age, current body mass index (BMI), BMI change during the last 10 years, dietary habits, breastfeeding history, residence area and education were assessed in multivariate analyses. RESULTS Median concentrations of p,p'-DDE and total PCBs were 85 and 240ng/g lipid, respectively. Based on multivariate analyses, the main predictors of high p,p'-DDE levels included age and frequent consumption of saltwater fish in women below 50 years, and high BMI in older women. Total PCB levels increased markedly with age. Among older women, other important predictors of high PCB levels included frequent consumption of saltwater fish and low BMI. Our results are also suggestive of an inverse association between PCB levels and BMI gain during the last ten years. Women in Côte d'Or had significantly higher PCB levels than women in Ille-et-Vilaine. CONCLUSION The patterns of associations between determinants and serum organochlorine concentrations suggest that human PCB contamination is still ongoing in France. The most important predictors of serum p,p'-DDE and PCB concentrations among French women include age, body mass index, dietary habits, and place of residence.
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Facchinetti P, Dorard E, Contremoulins V, Gaillard MC, Déglon N, Sazdovitch V, Guihenneuc-Jouyaux C, Brouillet E, Duyckaerts C, Allinquant B. SET translocation is associated with increase in caspase cleaved amyloid precursor protein in CA1 of Alzheimer and Down syndrome patients. Neurobiol Aging 2013; 35:958-68. [PMID: 24262202 DOI: 10.1016/j.neurobiolaging.2013.08.039] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Revised: 08/26/2013] [Accepted: 08/31/2013] [Indexed: 11/30/2022]
Abstract
Caspase cleaved amyloid precursor protein (APPcc) and SET are increased and mislocalized in the neuronal cytoplasm in Alzheimer Disease (AD) brains. Translocated SET to the cytoplasm can induce tau hyperphosphorylation. To elucidate the putative relationships between mislocalized APPcc and SET, we studied their level and distribution in the hippocampus of 5 controls, 3 Down syndrome and 10 Alzheimer patients. In Down syndrome and Alzheimer patients, APPcc and SET levels were increased in CA1 and the frequency of both localizations in the neuronal cytoplasm was high in CA1, and low in CA4. As the increase of APPcc is already present at early stages of AD, we overexpressed APPcc in CA1 and the dentate gyrus neurons of adult mice with a lentiviral construct. APPcc overexpression in CA1 and not in the dentate gyrus induced endogenous SET translocation and tau hyperphosphorylation. These data suggest that increase in APPcc in CA1 neurons could be an early event leading to the translocation of SET and the progression of AD through tau hyperphosphorylation.
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Research Support, Non-U.S. Gov't |
12 |
12 |
11
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Marquet-de Rougé P, Clamagirand C, Facchinetti P, Rose C, Sargueil F, Guihenneuc-Jouyaux C, Cynober L, Moinard C, Allinquant B. Citrulline diet supplementation improves specific age-related raft changes in wild-type rodent hippocampus. AGE (DORDRECHT, NETHERLANDS) 2013; 35:1589-1606. [PMID: 22918749 PMCID: PMC3776113 DOI: 10.1007/s11357-012-9462-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2011] [Accepted: 07/23/2012] [Indexed: 06/01/2023]
Abstract
The levels of molecules crucial for signal transduction processing change in the brain with aging. Lipid rafts are membrane microdomains involved in cell signaling. We describe here substantial biophysical and biochemical changes occurring within the rafts in hippocampus neurons from aging wild-type rats and mice. Using continuous sucrose density gradients, we observed light-, medium-, and heavy raft subpopulations in young adult rodent hippocampus neurons containing very low levels of amyloid precursor protein (APP) and almost no caveolin-1 (CAV-1). By contrast, old rodents had a homogeneous age-specific high-density caveolar raft subpopulation containing significantly more cholesterol (CHOL), CAV-1, and APP. C99-APP-Cter fragment detection demonstrates that the first step of amyloidogenic APP processing takes place in this caveolar structure during physiological aging of the rat brain. In this age-specific caveolar raft subpopulation, levels of the C99-APP-Cter fragment are exponentially correlated with those of APP, suggesting that high APP concentrations may be associated with a risk of large increases in beta-amyloid peptide levels. Citrulline (an intermediate amino acid of the urea cycle) supplementation in the diet of aged rats for 3 months reduced these age-related hippocampus raft changes, resulting in raft patterns tightly close to those in young animals: CHOL, CAV-1, and APP concentrations were significantly lower and the C99-APP-Cter fragment was less abundant in the heavy raft subpopulation than in controls. Thus, we report substantial changes in raft structures during the aging of rodent hippocampus and describe new and promising areas of investigation concerning the possible protective effect of citrulline on brain function during aging.
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research-article |
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Latouche A, Guihenneuc-Jouyaux C, Girard C, Hémon D. Robustness of the BYM model in absence of spatial variation in the residuals. Int J Health Geogr 2007; 6:39. [PMID: 17883857 PMCID: PMC2241594 DOI: 10.1186/1476-072x-6-39] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2007] [Accepted: 09/20/2007] [Indexed: 11/10/2022] Open
Abstract
Background In the context of ecological studies, the Bayesian hierarchical Poisson model is of prime interest when studying the association between environmental exposure and rare diseases. However, adding spatially structured extra-variability in the model fitted to the data when such extra-variability does not exist conditionally on the covariates included in the model (over-fitting) may bias the estimation of the ecological association between covariates and relative risks toward the null. In order to investigate that possibility, a simulation study of the impact of introducing unnecessary residual spatial structure in the estimation model was conducted. Results In the case where no underlying extra-variability from the Poisson process exists, the simulation results show that models accounting for structured and unstructured residuals do not underestimate the ecological association, unless covariates have a very strong autocorrelation structure, i.e., 0.98 at 100 km on a territory of diameter 1000 km."
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Research Support, Non-U.S. Gov't |
18 |
9 |
13
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Richardson S, Guihenneuc-Jouyaux C, Lasserre V. Re: Ecologic studies--biases, misconceptions, and counterexamples. Am J Epidemiol 1996; 143:522-3. [PMID: 8610668 DOI: 10.1093/oxfordjournals.aje.a008773] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
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Letter |
29 |
8 |
14
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Roda C, Guihenneuc-Jouyaux C, Momas I. Environmental triggers of nocturnal dry cough in infancy: new insights about chronic domestic exposure to formaldehyde in the PARIS birth cohort. ENVIRONMENTAL RESEARCH 2013; 123:46-51. [PMID: 23562392 DOI: 10.1016/j.envres.2013.03.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2012] [Revised: 03/04/2013] [Accepted: 03/11/2013] [Indexed: 06/02/2023]
Abstract
Although formaldehyde is a common indoor pollutant, its impact on respiratory symptoms in childhood remains unclear. The aim of this study was to examine the relation between domestic formaldehyde exposure and occurrence of coughing, one of the most prevalent respiratory symptoms during the first year of life of infants from the PARIS birth cohort involving 3840 healthy full-term babies. The presence of respiratory symptoms, including dry cough at night apart from a cold or chest infection in the past 12 months was reported on a standardized health questionnaire. Formaldehyde exposure was estimated for all infants using a predictive model established from data (both repeated measurements and information about determinants of levels) collected in a random sample of infants from the cohort. An unconditional logistic regression was fitted to study the relation between annual domestic formaldehyde exposure and dry cough at night, adjusting for all potential risk factors/confounders. The prevalence of dry cough at night was 14.9%. Parental history of allergy was found to modify the relation between environmental factors and dry cough. Cockroaches, used mattresses, and family stressor events were associated with dry cough in infants with parental allergy history. Conversely, domestic formaldehyde exposure tended to increase occurrence of dry cough at night only among babies without parental history of allergy (adjusted OR per 10 µg/m(3) increase in levels, single imputation approach: 1.45, 95% CI: 1.08-1.96, and Bayesian approach: 1.12, 0.91-1.36). This study suggests that the impact of indoor environmental exposure on dry cough at night in infancy is different depending on the presence or not of parental history of allergy.
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Chadeau-Hyam M, Clarke PS, Guihenneuc-Jouyaux C, Cousens SN, Will RG, Ghani AC. An application of hidden Markov models to the French variant Creutzfeldt-Jakob disease epidemic. J R Stat Soc Ser C Appl Stat 2010. [DOI: 10.1111/j.1467-9876.2010.00714.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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6 |
16
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Bachelet D, Verner MA, Guihenneuc-Jouyaux C, Charlier C, Charbonneau M, Haddad S, Guénel P. ASSESSMENT OF EXPOSURE TO PERSISTENT ORGANOCHLORINE COMPOUNDS IN EPIDEMIOLOGICAL STUDIES ON BREAST CANCER: A LITERATURE REVIEW AND PERSPECTIVES FOR THE CECILE STUDY. Acta Clin Belg 2014. [DOI: 10.1179/acb.2010.109] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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11 |
5 |
17
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Gajda D, Guihenneuc-Jouyaux C, Rousseau J, Mengersen K, Nur D. Use in practice of importance sampling for repeated MCMC for Poisson models. Electron J Stat 2010. [DOI: 10.1214/09-ejs527] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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15 |
4 |
18
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Guihenneuc-Jouyaux C, Rousseau J. Laplace Expansions in Markov chain Monte Carlo Algorithms. J Comput Graph Stat 2005. [DOI: 10.1198/106186005x25727] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20 |
3 |
19
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Viet AF, Fourichon C, Jacob C, Guihenneuc-Jouyaux C, Seegers H. Approach for qualitative validation using aggregated data for a stochastic simulation model of the spread of the bovine viral-diarrhoea virus in a dairy cattle herd. Acta Biotheor 2006; 54:207-17. [PMID: 17054022 DOI: 10.1007/s10441-006-8226-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2004] [Accepted: 04/26/2006] [Indexed: 11/24/2022]
Abstract
Qualitative validation consists in showing that a model is able to mimic available observed data. In population level biological models, the available data frequently represent a group status, such as pool testing, rather than the individual statuses. They are aggregated. Our objective was to explore an approach for qualitative validation of a model with aggregated data and to apply it to validate a stochastic model simulating the bovine viral-diarrhoea virus (BVDV) spread within a dairy cattle herd. Repeated measures of the level of BVDV-specific antibodies in the bulk-tank milk (total milk production of a herd) were used to summarise the BVDV herd status. First, a domain of validation was defined to ensure a comparison restricted to dynamics of pathogen spread well identified among observed aggregated data (new herd infection with a wide BVDV spread). For simulations, scenarios were defined and simulation outputs at the individual animal level were aggregated at the herd level using an aggregation function. Comparison was done only for observed data and simulated aggregated outputs that were in the domain of validation. The validity of our BVDV model was not rejected. Drawbacks and ways of improvement of the approach are discussed.
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Validation Study |
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2 |
20
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Ventura G, Le Plenier S, Choisy C, Guihenneuc-Jouyaux C, Neveux N, Sarfati G, Cynober L, De Bandt JP, Raynaud-Simon A. O23 Immunonutrition : effet de l’âge et du stress chirurgical sur la biodisponibilité de l’arginine plasmatique. NUTR CLIN METAB 2013. [DOI: 10.1016/s0985-0562(13)70295-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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21
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Guihenneuc-Jouyaux C. [Statistical modelization of geographic variations: a major challenge in epidemiology and statistics]. Rev Epidemiol Sante Publique 2002; 50:409-12. [PMID: 12471333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2023] Open
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Comment |
23 |
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McVinish R, Mengersen K, Nur D, Rousseau J, Guihenneuc-Jouyaux C. Recentered Importance Sampling With Applications to Bayesian Model Validation. J Comput Graph Stat 2012. [DOI: 10.1080/10618600.2012.681239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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