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Related Experiment Videos

A new treatment satisfaction measure for asthmatics: a validation study.

S D Mathias1, E H Warren, H H Colwell

  • 1The Lewin Group, San Francisco, CA 94107, USA. susan.mathias@lewin.com

Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation
|April 12, 2001
PubMed
Summary

The Patient Satisfaction with Asthma Medication (PSAM) questionnaire is a reliable and valid tool for assessing moderate asthma patients. It effectively measures satisfaction across key domains, aiding clinical trial research.

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Area of Science:

  • Pulmonary Medicine
  • Clinical Psychology
  • Health Services Research

Background:

  • Existing asthma treatment satisfaction questionnaires were either not comprehensive or too lengthy for clinical trials.
  • There was a need for a brief, validated instrument to measure patient satisfaction with asthma medications.

Purpose of the Study:

  • To develop and validate the Patient Satisfaction with Asthma Medication (PSAM) questionnaire for use in clinical trials.
  • To assess the reliability and validity of the PSAM in adult patients with moderate asthma.

Main Methods:

  • Developed the PSAM questionnaire for adult moderate asthmatics using inhaled medications.
  • Administered the PSAM along with the Asthma Quality of Life Questionnaire (AQLQ) to 53 participants.
  • Utilized variable clustering for scale identification and assessed reliability (Cronbach's Alpha, ICC) and validity (known-groups, PSAM-AQLQ correlations).

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Main Results:

  • Identified four PSAM scales: Inhaler Properties, Comparison with Other Medications, Overall Perception of Medication, and Relief.
  • Demonstrated good internal consistency (Cronbach's Alpha: 0.82-0.88) and acceptable test-retest reliability (ICC ≈ 0.70).
  • Showed significant differences across asthma control groups, supporting known-groups validity, with higher scores correlating with better control.

Conclusions:

  • The PSAM questionnaire is a reliable and valid instrument for assessing satisfaction in moderate asthmatics.
  • The PSAM is suitable for use in clinical trials involving inhaled asthma medications.
  • Future studies should evaluate the responsiveness of the PSAM questionnaire.