HD- IOI-HA results May04

The International Outcomes Inventory for Hearing Aids (IOI-HA)Australian results and the impact of hearing loss on outcomes : 

The International Outcomes Inventory for Hearing Aids (IOI-HA)Australian results and the impact of hearing loss on outcomes Harvey Dillon National Acoustic Laboratories

A problem : 

A problem PIPSL SHI HHS SHAPIE HPI HHIE HCA HAUQ HHIA APHAB HAPI SAC OI SSQ PHAP GP HMS COSI DSCF GHABP CPHI SHAPI SADL Dillon, NAL

Slide 3: 

IOI-HA concepts The result of an expert group – Eriksholme Workshop 1999 Capture all major dimensions of outcomes Short and simple Intended so that different delivery systems and countries can be compared Translated to 21 languages International Outcomes Inventory – Hearing Aids Dillon, NAL

IOI-HA questions (paraphrased slightly) : 

IOI-HA questions (paraphrased slightly) 1. On an average day, how many hours did you use the hearing aid? 2. How much has the hearing aid helped in the situation where you most wanted to hear better? 3. How much difficulty do you still have in that situation? 4. Overall, is your hearing aid worth the trouble? 5. How much do your hearing difficulties still affect the things you can do? 6. How much are other people still bothered by your hearing difficulties? 7. How much have your hearing aids changed you enjoyment of life? Use Benefit Residual activity limitation Satisfaction Residual participation restriction Impact on others Quality of life Dillon, NAL

IOI-HA Response scale : 

IOI-HA Response scale Five-point scale e.g. Question 3 – residual difficulty Very much difficulty Quite a lot of difficulty Moderate difficulty Slight difficulty No difficulty Scaled so that better outcomes (more benefit, less residual difficulties) have bigger numbers Dillon, NAL

International studies : 

International studies Dillon, NAL

International Outcomes Inventory - Hearing AidsIOI-HA : 

International Outcomes Inventory - Hearing AidsIOI-HA Dillon, NAL

Factor analysis : 

Factor analysis Which questions tend to be marked high or low together by the same people? Dillon, NAL

Two subscales : 

Two subscales Subscale 1 1. Use 2. Benefit 4. Satisfaction 7. Impact on quality of life Subscale 2 3. Residual activity limitation 5. Residual participation limitation 6. Residual impact on others Change Residual difficulty Dillon, NAL

Correcting for demographics : 

Correcting for demographics Hearing level in better ear Hearing level in worse ear Gender Age New or return client Scorei = c1 HLbetter + c2.HLworse + c3.Gender + c4.Age + c5.Type + ai B or Beta values Dillon, NAL

Multi-linear regression: beta values : 

Multi-linear regression: beta values Dillon, NAL

Multi-linear regression: beta values : 

Multi-linear regression: beta values Dillon, NAL

Important demographic variables : 

Important demographic variables Hearing loss Age New or return clients Dillon, NAL

Effect of demographics on total scores : 

Effect of demographics on total scores Dillon, NAL

Effect of demographics on total scores : 

Effect of demographics on total scores Biggest single effect: Return versus new clients rate use 0.44 scale points higher Dillon, NAL

Summary : 

Summary Simple measure available Australian results good Slightly affected by demographics Hearing loss Age New versus return clients Demographic effects strongest for individual questions and subscales Can correct data to allow for different demographics Dillon, NAL

Slide 17: 

The end