Auditory Brainstem Responses to Bone-Conducted Brief Tones in Young Children with Conductive or Sensorineural Hearing Loss

Table 2

Comparison of BC-ABR category to AC behavioural threshold data for 2000 Hz and 500 Hz.

			BC-ABR category (dBnHL)
			Normal	35–60	>60
2000 Hz; 104 ears	Behavioural outcome category (dBHL)	Normal	28 (26.9%)	0 (0%)	0 (0%)
		30–65	1 (1.0%)	25 (24.0%)	3 (2.9%)
		>65	0 (0%)	1 (1.0%)	46 (44.2%)
			Normal	25–45	>50
500 Hz; 47 ears	Behavioural outcome category (dBHL)	Normal	36 (76.6%)	0 (0%)	0 (0%)
		30–55	1 (2.1%)	5 (10.6%)	0 (0%)
		>55	0 (0%)	1 (2.1%)	4 (8.5%)

Percent of total ears in parentheses.
BC ABR “normal” levels: 30 and 20 dBnHL for 2000 and 500 Hz.
AC (and BC) behavioural “normal” levels are ≤25 dBHL.
Most behavioural threshold data are AC (2000 Hz: 89/104; 500 Hz: 33/47). See text for details.