Study Protocols Published on Open Science Framework 

Brehaut E, Neupane D, Levis B, Wu Y, Ioannidis JPA, Benedetti A, Thombs BD, and the and the DEPRESsion Screening Data (DEPRESSD) Collaboration. Optimal cutoff selection in depression screening studies using the PHQ-9, EPDS, and HADS. Open Science Framework. September 15, 2020. https://osf.io/fxhyw/

Neupane D, Bhandari PM, Levis B, Shrier I, Ioannidis JPA, Markham S, Thombs BD, Benedetti A, and the DEPRESsion Screening Data (DEPRESSD) Collaboration. Evaluation of direct and indirect methods for comparing the screening accuracy of the PHQ-9 and HADS-D: protocol for an individual participant data meta-analysis. Open Science Framework. June 8, 2020. https://osf.io/75v6u/

Bhandari PM, Levis B, Negeri Z, Wu Y, Ioannidis JPA, Shrier I, Cuijpers P, Thombs BD, Benedetti A, and the DEPRESsion Screening Data (DEPRESSD) Collaboration. Estimating confidence intervals for the Youden’s J optimal cutoff and correcting for optimism in associated accuracy estimates: Protocol for an analysis using individual participant data of the Patient Health Questionnaire-9. Open Science Framework. February 12, 2020. https://osf.io/5gqth/

Fischer F, Levis B, Falk C, Ioannidis J, Cuijpers P, Shrier I, Thombs B, Benedetti A, and the DEPRESsion Screening Data (DEPRESSD) PHQ Collaboration. Comparison of different scoring methods based on latent variable models of the PHQ-9: protocol for an individual participant data meta-analysis. Open Science Framework. September 12, 2019. https://osf.io/2tyc3/

Levis B, Bhandari PM, Benedetti A, Thombs BD and the DEPRESsion Screening Data (DEPRESSD) Collaboration. Evaluation of bias in diagnostic accuracy estimates due to data-driven cutoff selection: protocol for a simulation study using individual participant data from 58 studies on the diagnostic accuracy of the Patient Health Questionnaire-9 (PHQ-9). Open Science Framework. March 28, 2019. https://osf.io/pg2yc/ 

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