Table 1.

Summary of audiometric data of implantable bone conduction devices in clinical studies, only including studies that are reasonably comparable

Model	Type	No of subjects	PTAbc [dB HL]	Ages [years]	Etiology	Aided vs unaided sound field improvement			Reference
						PTA4 [dB HL]	SRT [dB HL]	SRS [%]
Bonebridge	Active trans	12	5–35	19–69	Cond, mixed	25	N/A	78,8	Sprinzl et al59
		4	24–36	45–63	Cond, mixed	36,5	36,25	N/A	Barbara et al60
		6	Average 26	40–57	Cond, mixed	34,9*	N/A	80,0*	Ihler et al62
		23	5–60	6–80	Cond, mixed, SSD	29‡	N/A	49	Riss et al63
BCI	Active trans	6	0–30	18–67	Cond, mixed	31,0	27,0	51,2†	Reinfeldt et al50
Sophono	Passive trans	20 of >100	Average 11	6–50	Cond	28,6	N/A	61,6	Siegert and Kanderske27
		6	0–11	5–11	Cond	22*	28*	61*	Hol et al28
		10	18–36	16–67	Cond, mixed	29,7*	34,1*	84,1*	Magliulo et al31
Baha Attract	Passive trans	9 of 12	3–26	5–65	Cond	19	19	N/A	Işeri et al33
BAHA HC 200	Per	110–122	−1–45	Average 54	Cond, mixed	29,4	26,5	41,6†	Tjellström and Håkansson35

Notes:

^*Unaided measured with headphones

^†SRS was measured with competing noise, signal-to-noise ratio =4 dB

^‡average of 0.5, 1, 2, 3, 4, and 6 kHz.

Abbreviations: BAHA, bone-anchored hearing aid; BCI, bone-conduction implant; cond, conductive; HL, hearing level; N/A, not applicable; per, percutaneous; PTA₄, four-frequency averages of pure-tone audiometry; PTAbc, pure-tone average for bone-conduction; SRS, speech-recognition score; SRT, speech-recognition thresholds; SSD, single-sided deafness; trans, transcutaneous.