Overactivity index: A noninvasive and objective outcome measure in overactive bladder in children.

Introduction: Reports showed that observing detrusor overactivity (DO) and maximum cystometric capacity (MCC) may guide rational pharmacotherapy. Since urodynamic studies (UDS) are challenging for both patients and the healthcare system, a non-invasive objective prognostic marker is preferable.

Objectives: To investigate the value of the overactivity index (OI), a non-invasive measure calculated from the frequency-volume chart (FVC), for predicting the presence of symptoms and abnormal UDS in children with non-neurogenic OAB.