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.

Following publication of the original article [1], the authors reported that the following notation wasn't used consistently.

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:

Unit-nonresponse

Item-nonresponse