Table 3.

Audiological Variables.

Acronym or name	Description (units)
PTT	Pure tone thresholds (dB HL). Clinically measured audiometric thresholds averaged across test frequencies.
Air-bone gap	Air-bone conduction gap (dB). The difference between air- and bone-conduction audiometric thresholds averaged across test frequencies.
ULL	Uncomfortable loudness levels (dB HL). The lowest sound levels for monaurally played pure tones of one-second duration that were judged as uncomfortably loud averaged across test frequencies.
SRTQ	Unaided speech reception threshold in quiet (dB HL). The sound pressure level at which the listener was able to correctly reproduce 50% of the disyllabic words presented in quiet unaided. Lower values indicate better performance.

Note. For detailed information, see Appendix A.