Recall bias in pain scores evaluating abdominal wall and groin pain surgery.
Willem A R ZwaansJ A de BruijnJ P DielemanE W SteyerbergM R M ScheltingaR M H RoumenPublished in: Hernia : the journal of hernias and abdominal wall surgery (2022)
One in seven patients undergoing remedial groin surgery is misclassified on the basis of retrospectively obtained pre-operative pain scores (success instead of failure, or vice versa). Misclassifications are relatively more present in failures after surgery. Therefore, the effect size of a therapy erroneously depends on its success rate.