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Correction: Designing effective graphs to get your message across

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Boers M. Designing effective graphs to get your message across. Ann of Rheum Dis 2018;77:833–9. doi:10.1136/annrheumdis-2018-213396

On page 835 of the article the ‘null zone’ is introduced, a way to graphically express statistical tests of differences between groups, and in Online appendix 4 a spreadsheet is offered to help calculate the necessary numbers. Unfortunately, this spreadsheet contained an error and has been replaced. Appendix 4 now contains the corrected version.

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