Karen Leffondre

Summary

Country: Canada

Publications

  1. ncbi Flexible modeling of exposure-response relationship between long-term average levels of particulate air pollution and mortality in the American Cancer Society study
    Michal Abrahamowicz
    Department of Epidemiology and Biostatistics, McGill University, Montreal, Quebec, Canada
    J Toxicol Environ Health A 66:1625-54. 2003
  2. ncbi Modelling smoking history using a comprehensive smoking index: application to lung cancer
    Karen Leffondre
    Department of Social and Preventive Medicine, University of Montreal, Que, Canada
    Stat Med 25:4132-46. 2006
  3. doi A weighted Cox model for modelling time-dependent exposures in the analysis of case-control studies
    Karen Leffondre
    Department of Social and Preventive Medicine, University of Montreal, Montreal, Canada
    Stat Med 29:839-50. 2010
  4. doi Consultation with an arthritis specialist for children with suspected juvenile rheumatoid arthritis: a population-based study
    Debbie Ehrmann Feldman
    Faculte de Medecine, Ecole de readaptation, Universite de Montreal, CP 6128, Succursale Centre Ville, Montreal, QC H3C 3J7, Canada
    Arch Pediatr Adolesc Med 162:538-43. 2008
  5. ncbi Modeling smoking history: a comparison of different approaches
    Karen Leffondre
    Department of Epidemiology and Biostatistics, Faculty of Medicine, McGill University, Montreal, Quebec, Canada
    Am J Epidemiol 156:813-23. 2002
  6. pmc Consultation with cardiologists for persons with new-onset chronic heart failure: a population-based study
    Debbie Ehrmann Feldman
    Ecole de readaptation, Universite de Montreal, Montreal, Canada
    Can J Cardiol 25:690-4. 2009
  7. ncbi Bias due to aggregation of individual covariates in the Cox regression model
    Michal Abrahamowicz
    Department of Epidemiology and Biostatistics, McGill University, Montreal, Quebec, Canada
    Am J Epidemiol 160:696-706. 2004
  8. ncbi Evaluation of Cox's model and logistic regression for matched case-control data with time-dependent covariates: a simulation study
    Karen Leffondre
    Department of Epidemiology and Biostatistics, McGill University, Montreal, Quebec, Canada
    Stat Med 22:3781-94. 2003
  9. pmc On the proportional hazards model for occupational and environmental case-control analyses
    Héloïse Gauvin
    Department of Social and Preventive Medicine, University of Montreal, PO Box 6128, Downtown Station, Montreal, Quebec H3C 3J7, Canada
    BMC Med Res Methodol 13:18. 2013
  10. ncbi Delay in consultation with specialists for persons with suspected new-onset rheumatoid arthritis: a population-based study
    Debbie Ehrmann Feldman
    Université de Montréal and Public Health Department of Montréal, Montreal, Quebec, Canada
    Arthritis Rheum 57:1419-25. 2007

Detail Information

Publications13

  1. ncbi Flexible modeling of exposure-response relationship between long-term average levels of particulate air pollution and mortality in the American Cancer Society study
    Michal Abrahamowicz
    Department of Epidemiology and Biostatistics, McGill University, Montreal, Quebec, Canada
    J Toxicol Environ Health A 66:1625-54. 2003
    ..It was concluded that flexible modeling yields new insights about the effect of long-term air pollution on mortality...
  2. ncbi Modelling smoking history using a comprehensive smoking index: application to lung cancer
    Karen Leffondre
    Department of Social and Preventive Medicine, University of Montreal, Que, Canada
    Stat Med 25:4132-46. 2006
    ..The results suggest that the CSI may be an attractive and parsimonious alternative to conventional modelling of different aspects of smoking history for lung cancer...
  3. doi A weighted Cox model for modelling time-dependent exposures in the analysis of case-control studies
    Karen Leffondre
    Department of Social and Preventive Medicine, University of Montreal, Montreal, Canada
    Stat Med 29:839-50. 2010
    ..The investigated weighted Cox model is a potential alternative method to analyse matched or unmatched population-based case-control studies with time-dependent exposures...
  4. doi Consultation with an arthritis specialist for children with suspected juvenile rheumatoid arthritis: a population-based study
    Debbie Ehrmann Feldman
    Faculte de Medecine, Ecole de readaptation, Universite de Montreal, CP 6128, Succursale Centre Ville, Montreal, QC H3C 3J7, Canada
    Arch Pediatr Adolesc Med 162:538-43. 2008
    ..To describe consultation with an arthritis specialist because of suspected new-onset juvenile rheumatoid arthritis (JRA) and to determine factors associated with prompt consultation...
  5. ncbi Modeling smoking history: a comparison of different approaches
    Karen Leffondre
    Department of Epidemiology and Biostatistics, Faculty of Medicine, McGill University, Montreal, Quebec, Canada
    Am J Epidemiol 156:813-23. 2002
    ..4) When estimating the effects of time since cessation or age at initiation, it is still useful to use cigarette-years, because it reduces multicollinearity...
  6. pmc Consultation with cardiologists for persons with new-onset chronic heart failure: a population-based study
    Debbie Ehrmann Feldman
    Ecole de readaptation, Universite de Montreal, Montreal, Canada
    Can J Cardiol 25:690-4. 2009
    ..It is recommended that persons recently diagnosed with heart failure consult with a specialist in heart failure...
  7. ncbi Bias due to aggregation of individual covariates in the Cox regression model
    Michal Abrahamowicz
    Department of Epidemiology and Biostatistics, McGill University, Montreal, Quebec, Canada
    Am J Epidemiol 160:696-706. 2004
    ....
  8. ncbi Evaluation of Cox's model and logistic regression for matched case-control data with time-dependent covariates: a simulation study
    Karen Leffondre
    Department of Epidemiology and Biostatistics, McGill University, Montreal, Quebec, Canada
    Stat Med 22:3781-94. 2003
    ..The magnitude of the latter bias is proportional to the true effect, suggesting that an improved manipulation of the risk sets may eliminate, or at least reduce, the bias...
  9. pmc On the proportional hazards model for occupational and environmental case-control analyses
    Héloïse Gauvin
    Department of Social and Preventive Medicine, University of Montreal, PO Box 6128, Downtown Station, Montreal, Quebec H3C 3J7, Canada
    BMC Med Res Methodol 13:18. 2013
    ....
  10. ncbi Delay in consultation with specialists for persons with suspected new-onset rheumatoid arthritis: a population-based study
    Debbie Ehrmann Feldman
    Université de Montréal and Public Health Department of Montréal, Montreal, Quebec, Canada
    Arthritis Rheum 57:1419-25. 2007
    ..We wished to determine whether patients suspected of having new-onset RA in Québec consulted with a rheumatologist, to document any delay in these consultations, and to determine factors associated with prompt consultation...
  11. ncbi Clustering patients according to health perceptions: relationships to psychosocial characteristics and medication nonadherence
    Maida J Sewitch
    Groupe de recherche interdisciplinaire en sante, Faculte de Medecine, Universite de Montreal C P 6128, Succ Centre Ville, Montreal, Quebec, Canada, H3C 3J7
    J Psychosom Res 56:323-32. 2004
    ..Our objectives were to identify systematic multivariate patterns of perceptions using cluster analysis, and to investigate associations among the clusters, psychosocial characteristics and medication nonadherence...
  12. pmc Brain tumours and cigarette smoking: analysis of the INTERPHONE Canada case-control study
    Stephen Vida
    Centre de Recherche, Centre Hospitalier de l Universite de Montreal CHUM, Montreal, Quebec, Canada
    Environ Health 13:55. 2014
    ..There is conflicting evidence regarding the associations between cigarette smoking and glioma or meningioma. Our purpose is to provide further evidence on these possible associations...
  13. ncbi Statistical measures were proposed for identifying longitudinal patterns of change in quantitative health indicators
    Karen Leffondre
    Department of Epidemiology and Biostatistics, Faculty of Medicine, McGill University, Montreal, Quebec, Canada
    J Clin Epidemiol 57:1049-62. 2004
    ..To propose statistical measures to identify different longitudinal patterns of change in quantitative health indicators...