preferred_name: Air-bone gap of greater than 20 dB across 0.5 to 2 kHz
preferred_name_lc: air-bone gap of greater than 20 db across 0.5 to 2 khz
label: Air-bone gap of greater than 20 dB across 0.5 to 2 kHz
label_lc: air-bone gap of greater than 20 db across 0.5 to 2 khz