Figure 1 : Duration of epidural analgesia: boxplot presenting the duration of epidural analgesia for groups 1 to
4
(≤24, >24 to ≤48, >48 to ≤72, and >72 hours of epidural analgesia respectively). Results are median and IQR.

Koolwijk et al.Journal of Anesthesiology and Clinical Science  2013 2:27DOI : 10.7243/2049-9752-2-27