SSD	Single-sided deaf side, i.e., poorer ear (PTA ≥70 dB HL)
AH	Acoustic-hearing side, i.e., better ear (PTA ≤30 dB HL in the SSD group or >30 dB HL and ≤55 dB HL in the AHL group)
Unaided	Listening condition with no (Bi)CROS-HA, BCD, or CI device worn on the SSD side; participants (in the AHL group) who are fitted with an HA on the contralateral ear should wear the HA; the poorer ear shall not be plugged or masked, as this does not simulate a realistic listening scenario
Aided	Listening condition with the (Bi)CROS-HA, BCD, or CI device worn and activated on the SSD side; participants (in the AHL group) who are fitted with an HA on the contralateral ear should be provided with a BiCROS-HA device if possible.