Absence seizure provocation during routine EEG: Does position of the child during hyperventilation affect the diagnostic yield?

•Body position during HV may affect its yield in provoking absence seizures.•Absence seizures were more easily provoked in a sitting position.•Absence duration was generally longer in the supine position than while sitting.•Younger age was associated with shorter absences in the supine position.•Performing HV only in the supine position may lead to missing absence seizures.