Correction
Following publication of the original article [1], the authors reported that the following notation wasn’t used consistently. The original article has been corrected.
The correct notation is as follows:
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Unit-nonresponse
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Item-nonresponse
Reference
Rombach I, et al. Multiple imputation for patient reported outcome measures in randomised controlled trials: advantages and disadvantages of imputing at the item, subscale or composite score level. BMC Med Res Methodol. 2018;18:87. https://doi.org/10.1186/s12874-018-0542-6.
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Rombach, I., Gray, A.M., Jenkinson, C. et al. Correction to: multiple imputation for patient reported outcome measures in randomised controlled trials: advantages and disadvantages of imputing at the item, subscale or composite score level. BMC Med Res Methodol 18, 107 (2018). https://doi.org/10.1186/s12874-018-0563-1
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DOI: https://doi.org/10.1186/s12874-018-0563-1