All anomalies associated with orofacial clefts were collected.
Preintervention hearing outcome
For those who received a management intervention, this would be the last available audiological assessment prior to the intervention.
Postintervention hearing outcome
This would be the most recent audiological assessment after the intervention.
Type of cleft
This was classified as cleft of soft palate, cleft of hard and soft palate, unilateral cleft lip and palate, bilateral cleft lip and palate and cleft lip only.
Complications
The complications recorded were those that occurred during or directly after the intervention.
Regions
This would be categorised according to one of the 14 centres in the locality.
Type of intervention
The expanded data set is HA, VT, , HAVT, VTHA, and watchful waiting.