Table 1.

Hearing-Aid Outcome Measures.

Acronym	Description
SRTN	Speech reception threshold in noise (dB SNR). The signal-to-noise ratio (SNR, in decibels) at which the hearing-aid user understands 50% of the sentences presented in a (time-reversed) two-talker background. It was measured with the user wearing his/her two hearing aids. Lower values indicate better performance.
SSQB	Self-reported improvement in hearing ability obtained from using hearing aids. It was assessed using the speech, spatial, and qualities questionnaire (Gatehouse & Noble, 2004) slightly modified to assess hearing improvement rather than hearing ability (Jensen et al., 2009). Three outcome measures were obtained, one for each of the speech, spatial, and qualities sections of the questionnaire. Larger values indicate greater improvement.
COSI	Client Oriented Scale of Improvement questionnaire (Dillon et al., 1997). Aimed at assessing the improvements obtained from hearing-aid treatment tailored to the deficits considered important for and by each individual. Larger values indicate greater improvement.
IOI-HA	International Outcome Inventory for Hearing Aids. A minimum core set of questions for assessing hearing-aid user outcomes (Cox et al., 2000, 2002). Larger values indicate greater levels of satisfaction.

Note. For detailed information, see Appendix A.