In comparing pure-tone-average-aided thresholds (PTA 0.5, 1, 2 and 3 kHz) to unaided thresholds, a significant improvement was shown for both devices, and no significant difference was observed between devices. Looking at specific frequencies, a significant difference was observed at 4 and 6 kHz, at which BP110 provided more amplification compared to Ponto Pro Power.
A speech intelligibility test using the Freiburg monosyllabic speech test showed no significant difference between devices. Speech perception thresholds in noise using the Oldenburg Sentence Test (OLSA) showed a significant improvement for both devices in comparison to unaided, but the results did not differ between devices.
The authors conclude: “The discrepancy between objective audiometric results and subjective evaluation is evidence that tested listening situations in soundproof test rooms do not reflect real-life situations, and those audiometric tests are not able to screen differences between real-life performances in test subjects.”
About the study
The study was a prospective crossover study conducted at EC Hannover Medical Center. The study participants were 11 test subjects with a bone conduction hearing threshold ranging from 5.0 to 40.0 dB HL. The same test subjects completed audiological and subjective outcome measurements with two different devices, tested in sequential order. First, fitting was completed with one device, followed by a test period of 3 weeks. The researchers then performed audiological and subjective outcome measurements on this device, after which the other device was fitted and tested. Device test order was randomised in order to avoid bias.
Busch, S., Giere, T., Lenarz, T. & Maier, H. (2015) Comparison of Audiological Results and Patient Satisfaction for Two Osseointegrated Bone Conduction Devices: Results of a Prospective Study. Otology & Neurology. Jun; 36(5):842–848.