Published Peer-Reviewed Abstracts 

Levis B, Yan XW, He C, Benedetti A, Thombs BD. Overestimation of depression prevalence in meta-analyses via the inclusion of primary studies that assessed depression using screening tools or rating scales rather than validated diagnostic interviews. In: Preventing Overdiagnosis Abstracts, August 2018, Copenhagen. BMJ Evidence-Based Medicine. 2018;23(Suppl 2):46

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. In: Methods for Evaluation of medical prediction Models, Tests and biomarkers (MEMTAB) 2018 Symposium. Diagnostic and Prognostic Research. 2018;2(Suppl 1):12:020. 

Levis B, Benedetti A, Riehm KE, Saadat N, Levis AW, Azar M, Rice DB, Chiovitti MJ, 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: an individual participant data meta-analysis comparing reference standards. In: Methods for Evaluation of medical prediction Models, Tests and biomarkers (MEMTAB) 2018 Symposium. Diagnostic and Prognostic Research. 2018;2(Suppl 1):12:P40

Levis B, Benedetti A, Riehm KE, Saadat N, Levis AW, Azar M, Rice DB, Chiovitti MJ, Sanchez TA, Thombs BD, and the DEPRESSD Research Group. Are semi-structured and fully structured diagnostic interviews equivalent reference standards for major depression? An individual participant data meta-analysis comparing diagnoses across diagnostic interviews. In: Methods for Evaluation of medical prediction Models, Tests and biomarkers (MEMTAB) 2018 Symposium. Diagnostic and Prognostic Research. 2018;2(Suppl 1):12:P41. 

Levis B, Benedetti A, Levis AW, Ioannidis JPA, Shrier I, Cuijpers P, Gilbody S, Kloda LA, McMillan D, Patten SB, Steele RJ, Ziegelstein RC, Bombardier CH, de Lima Osório F, Fann JR, Gjerdingen D, Lamers F, Lotrakul M, Loureiro SR, Löwe B, Shaaban J, Stafford L, van Weert HCPM, Whooley MA, Williams LS, Wittkampf KA, Yeung AS, Thombs BD. Selective cutoff reporting in studies of diagnostic test accuracy: a comparison of conventional and individual patient data meta-analyses of the Patient Health Questionnaire-9 depression screening tool. In: Methods for Evaluating Medical Tests and Biomarkers. Diagnostic and Prognostic Research. 2017;1(Suppl 1):7:P57.

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