Peer-Reviewed Oral Conference Presentations

Levis B, Benedetti A, Rücker G, Jones HE, Thombs BD, and the DEPRESSD Collaboration. An empirical comparison of methods for meta-analysis of diagnostic accuracy when studies selectively report cutoffs. 40th Annual Conference of the International Society for Clinical Biostatistics. Leuven, Belgium. July 2019. 

Wu Y, Levis B, Thombs BD, Benedetti A, and the DEPRESsion Screening Data (DEPRESSD) Collaboration. Evaluation of the equivalency of the PHQ-8 and PHQ-9: A systematic review and individual participant data meta-analysis. McGill Epidemiology, Biostatistics and Occupational Health 12th Annual Student Research Day. Montreal, Quebec, Canada. March 2019. 

Levis B, Rücker G, Jones HE, Thombs BD, Benedetti A, and the DEPRESSD Research Group. Estimating diagnostic accuracy when primary studies selectively report cutoffs: Individual participant data meta-analysis versus three methods for analyzing published data. 2018 Cochrane Colloquium. Edinburgh, Scotland. September 2018. 

Levis B, Rücker G, Jones HE, Thombs BD, Benedetti A, and the DEPRESSD Research Group. Estimating diagnostic test accuracy in the context of incomplete reporting across cutoff thresholds: A comparison of conventional meta-analysis of published data, two modelling approaches using published data, and individual participant data meta-analysis. Methods for Evaluating Medical Tests and Biomarkers (MEMTAB) Conference. Utrecht, Netherlands. July 2018. 

Levis B, Benedetti A, Riehm KE, Saadat N, Levis AW, Azar M, Rice DB, Chiovitti M, Sanchez TA, Thombs BD, and the DEPRESSD Research Group. Diagnostic accuracy of the PHQ-9 depression screening tool compared to semi-structured versus fully structured diagnostic interviews for major depression: An individual participant data meta-analysis comparing reference standards. Ninth Annual Lady Davis Institute for Medical Research Scientific Retreat. Montreal, Quebec, Canada. May 2018. 

Levis B, Benedetti A, Riehm KE, Saadat N, Levis AW, Azar M, Rice DB, Chiovitti M, Sanchez TA, Thombs BD, and the DEPRESSD Research Group. Diagnostic accuracy of the PHQ-9 depression screening tool compared to semi-structured versus fully structured diagnostic interview reference standards: An individual participant data meta-analysis. McGill Epidemiology, Biostatistics and Occupational Health 11th Annual Student Research Day. Montreal, Quebec, Canada. March 2018. 

Harel D, Ishihara M, Levis B, Thombs BD. Optimal methods for shortening patient-reported outcome measures. International Conference on Health Policy Statistics, Charleston, SC, USA. January 2018. 

Levis B, Benedetti A, Riehm KE, Saadat N, Levis AW, Azar M, Rice DB, Chiovitti M, Thombs BD, and the DEPRESSD Research Group. Overdiagnosis of major depression based on lay-administered fully structured diagnostic interviews. Preventing Overdiagnosis 2017. Quebec City, Quebec, Canada. August 2017. 

Levis B, Benedetti A, Riehm KE, Saadat N, Levis AW, Azar M, Rice DB, Chiovitti M, Thombs BD, and the DEPRESSD Research Group. Underestimation of depression screening tool sensitivity when using lay-administered fully structured diagnostic interviews as the reference standard: an individual patient data meta-analysis. Cochrane Canada Symposium. Hamilton, Ontario, Canada. May 2017. 

Levis B, Benedetti A, Riehm KE, Saadat N, Levis AW, Azar M, Rice DB, Chiovitti M, Thombs BD, and the DEPRESSD Research Group. Diagnostic interviews for major depression: A comparison of diagnoses made using semi-structured vs. fully structured clinical interviews. McGill Epidemiology, Biostatistics and Occupational Health 11th Annual Student Research Day. Montreal, Quebec, Canada. April 2017. 

Levis B, Benedetti A, Thombs BD. Selective cutoff reporting in diagnostic test accuracy studies of depression screening tools: Comparing traditional meta-analysis to individual patient data meta-analysis. 2015 Cochrane Colloquium. Vienna, Austria. October 2015. 

Levis B, Benedetti A, Thombs BD. Selective cutoff reporting in studies of diagnostic test accuracy of depression screening tools: Comparing traditional meta-analysis to individual patient data meta-analysis. Preventing Overdiagnosis 2015. Bethesda, Maryland, USA. September 2015. 

Levis B, Benedetti A, Levis AW, Thombs BD. Selective reporting in studies of diagnostic test accuracy: Comparing traditional meta-analysis to individual patient data meta-analysis to assess the diagnostic accuracy of the Patient Health Questionnaire-9. In symposium (BD Thombs, Chair), Improving evidence-based psychological services by identifying and reducing reporting biases. 76th Canadian Psychological Association Annual Convention. Ottawa, Ontario, Canada. June 2015. 

Simoneau G, Levis B, Thombs BD, Benedetti A. An empirical comparison of methods to meta-analyze individual patient data of diagnostic accuracy. Statistical Society of Canada (SSC) Student Annual Conference. Halifax, Nova Scotia, Canada. June 2015. 

Levis B. Selective cutoff reporting in studies of diagnostic accuracy of depression screening tools: Comparing traditional meta-analysis to individual patient data meta-analysis. McGill Epidemiology, Biostatistics and Occupational Health 11th Annual Student Research Day. Montreal, Quebec, Canada. April 2015. 

Levis B, Thombs BD. Individual Patient Data (IPD) meta-analysis to overcome shortcomings in traditional meta-analysis of screening test accuracy. 74th Canadian Psychological Association Annual Convention. Quebec City, Quebec, Canada. June 2013. 

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