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Missing outcome data in meta-analysis
  1. Dimitris Mavridis1,2,
  2. Anna Chaimani1,
  3. Orestis Efthimiou1,
  4. Georgia Salanti1
  1. 1 Department of Hygiene and Epidemiology, University of Ioannina School of Medicine, Ioannina, Greece;
  2. 2 Department of Primary Education, University of Ioannina, Ioannina, Greece.
  1. Correspondence to  Dimitris Mavridis, dimi.mavridis{at}


Missing outcome data is a common problem in mental health trials compromising the validity of results and leading to the loss of precision. The problem is accumulated in a meta-analysis of clinical trials with missing outcome data.

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  • Competing interests DM and GS received research funding from the European Research Council (IMMA 260559), AC and OE received funding from Greek national funds through the operational programme ‘Education and Lifelong Learning’ of the National Strategic Reference Framework (NSRF)–Research Funding Program: ARISTEIA. Investing in knowledge society through the European Social Fund.