4.1 Group 1 (Middle Ear Disease)
For group 1, the 23 patients with middle ear disease, the measured PTA4 values for the air and bone conduction HL are presented in Fig 1. The dotted and the dashed lines point the indication criteria for the ADHEAR system (BC PTA4 ≤ 25 dB HL) and for the BAHA 5 Power system (BC PTA4 ≤ 55 dB HL), respectively. Fig 1 shows that 23 patients were aided with the ADHEAR system, while the HL of only 11 patients is within the ADHEAR criterion. Ten patients were aided with both the ADHEAR and the BAHA 5 Power system, while the HL of 6 patients is within the ADHEAR criterion.