Der Freiburger Index für Patientenzufriedenheit: Vorstellung eines neuen Instruments und seiner psychometrischen Eigenschaften

Background: In the era of evidence-based medicine health-related quality of life measurements are recognized as valuable indicative factors. Because there was no generally applicable questionnaire addressing patient satisfaction after interventional or surgical procedures, the Freiburg Index of Patient Satisfaction was developed and psychometrically evaluated. Methods: A preliminary version was evaluated and optimized through structured interviews with 20 patients (qualitative pre-study). The final questionnaire was then applied to 257 urological patients and a comprehensive statistical analysis including validation to a matching questionnaire (ZUF-8, Kriz 2008) was performed. Results: All psychometric qualities scored well. The examined sample showed no missing values and no ceiling effect as otherwise found frequently: the most positive answer categories accounted for 43.6% of cases. Reliability (Cronbachs Alpha =0.84, discriminatory power =0.50) was high. Furthermore the results of a factor analysis proofed unidimensionality of the questionnaire. Validity was shown by a close correlation between FIPS and ZUF-8 scores (r=0.747, p<.001). Conclusion: The Freiburg Index of Patient Satisfaction is a generally applicable questionnaire to evaluate treatment satisfaction after interventional or surgical procedures. The questionnaire can be used to objectify results and increase comparability of clinical studies and quality in health care.