berk-protocolupdateand-2019.pdf (526.75 kB)
Download file

Protocol update and statistical analysis plan for CADENCE-BZ: a randomized clinical trial to assess the efficacy of sodium benzoate as an adjunctive treatment in early psychosis

Download (526.75 kB)
journal contribution
posted on 2019-04-08, 00:00 authored by Carmen Lim, Andrea Baker, Sukanta Saha, Sharon Foley, Anne Gordon, David Ward, Bjorn Burgher, Frances Dark, Martin Beckmann, Stephen Stathis, George Bruxner, Alex Ryan, Drew Richardson, Sean Hatherill, Michael BerkMichael Berk, Olivia DeanOlivia Dean, John McGrath, Cadence Working Group, James Scott
BACKGROUND: CADENCE-BZ is a multi-centre, parallel-group, double-blind randomized controlled trial designed to examine the clinical efficacy and safety of an accessible food preservative, sodium benzoate, as an add-on treatment for patients with early psychosis. The original study protocol was published in 2017. Here, we describe the updated protocol along with the Statistical Analysis Plan (SAP) for the CADENCE-BZ trial prior to study completion. METHODS AND MATERIALS: Two important changes were made to the original protocol: (1) improvements to our statistical analysis plan permitted a reduction in sample size; and (2) a revision in the secondary outcomes with the intent of reducing redundancy and excluding those measures that were not appropriate as outcomes. CONCLUSIONS: We provide the updated SAP prior to the completion of the study with the intent of increasing the transparency of the data analyses for CADENCE-BZ. The final participants are currently completing the study and the results will be published in the near future. TRIAL REGISTRATION: Australian New Zealand Clinical Trials Registry ( ACTRN12615000187549 ). Registered on 26th February 2015.








Article number



BioMed Central


London, Eng.





Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2019, The Authors