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Validation of the SADL questionnaire.

R M Cox1, G C Alexander

  • 1Department of Veterans Affairs Medical Center, Memphis, Tennessee, USA.

Ear and Hearing
|April 28, 2001
PubMed
Summary

The Satisfaction with Amplification in Daily Life (SADL) questionnaire shows strong internal and construct validity for hearing aid users. Satisfaction scores are generally consistent with norms, with higher scores noted for third-party pay clients.

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Area of Science:

  • Audiology
  • Psychometrics
  • Hearing Healthcare

Background:

  • The Satisfaction with Amplification in Daily Life (SADL) questionnaire is a key tool for assessing hearing aid user satisfaction.
  • Previous research established the initial psychometric properties of the SADL questionnaire.
  • Cross-validation is essential to confirm the reliability and validity of assessment tools in clinical practice.

Purpose of the Study:

  • To cross-validate the psychometric characteristics of the SADL questionnaire.
  • To explore the construct validity of the SADL questionnaire in a contemporary hearing aid user population.
  • To compare current satisfaction norms with previously established benchmarks.

Main Methods:

  • 196 usable responses from adults who recently obtained hearing aids were collected via mail from 13 audiology clinics.
  • Psychometric properties of the SADL questionnaire items were analyzed.
  • SADL scores were correlated with a traditional single-item satisfaction measure to assess construct validity.

Main Results:

  • The SADL questionnaire demonstrated strong internal validity, with item characteristics consistent with prior research.
  • A statistically significant relationship between SADL scores and a single-item measure supported the construct validity of the SADL.
  • Private-pay clients' satisfaction scores aligned with existing norms, while third-party pay clients reported higher satisfaction.
  • A trend towards higher satisfaction in the Negative Features subscale was observed across most client types.

Conclusions:

  • The SADL questionnaire is a valid and reliable instrument for measuring hearing aid user satisfaction.
  • Existing SADL norms are largely applicable to private-pay clients, but may need revision for the Negative Features subscale.
  • Further investigation into the impact of payment source (private vs. third-party) on hearing aid satisfaction is warranted.

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