1.   For relaxations that occurred during common cavity episodes, the reference basal UOS pressure was derived from the UOS pressure values during the common cavity.

2.   Tables II and III show the mean values for basal UOS pressure according to arousal state, symptom classification, and presence or absence of neurological deficit.

3.   The existence of a neurological deficit was also shown to have no significant effect on basal UOS pressure.

4.   The amplitude was measured from the midrespiratory basal pressure level to the peak of the pressure wave.

5.   The onset of the pressure wave was the point where the tangent of the sudden upstroke of the wave crossed the basal pressure.

6.   Basal pressures in the spinal group were similar to those in normal subjects but conscious control of sphincter activity was abolished in all spinal patients.

7.   We did not study anal basal pressure, which is commonly believed to play a significant part in preserving faecal continence for liquids.

8.   Our balloon probe is not suitable for this, but anal basal pressure would not seem to influence the outcome of patients receiving biofeedback treatment.