Does bladder capacity assessment by frequency/volume chart correlate well with urodynamic estimation in children with spina bifida?
INTRODUCTION: Reduced capacity is a common feature of the neuropathic bladder seen in children with spina bifida. This impacts on urinary continence and, in severe cases, may require augmentation cystoplasty. The traditional means of assessing bladder size has been urodynamics. A frequency/volume chart may also provide this information, but the technique may not be so scientifically controlled. It is unclear how well the results of these two modalities correlate. MATERIALS AND METHODS: One hundred and twenty-two urodynamic studies and one-week frequency/volume charts were completed by 77 children and adolescents (aged 3 – 18 years) involved in a therapeutic trial. The maximum bladder capacity at urodynamics and the largest of the listed voided urinary volumes over the week for each child were compared using the paired, samples t-test. A scatter plot correlation analysis was performed, along with a Bland-Altman test for method comparison. RESULTS: A mean difference in bladder capacity e
