The International Outcome Inventory for Hearing Aids (IOI-HA) and its relationship to the Client-oriented Scale of Improvement (COSI).

The International Outcome Inventory-Hearing Aids (IOI-HA) was administered to 161 consecutive patients who had been fitted with hearing aids just prior to their being discharged from the clinic. Most also completed the Client-oriented Scale of Improvement (COSI). Very few questions (<2%) were not completed. Analyses indicated two subscales of IOI-HA, one of which could be defined as a 'benefit' subscale and the other a 'residual problems' subscale. Both elements of COSI correlated with the 'benefit' subscale, but only the 'residual' measure of COSI related to the 'residual problems' subscale. There were no consistent relationships between the IOI-HA and a range of demographic factors.