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The American Journal of Sports Medicine 25:642-647 (1997)
© 1997 SAGE Publications

Does the Mode of Data Collection Change Results in a Subjective Knee Score?

Self-Administration Versus Interview

Jürgen Höher, MD

Division of Trauma Surgery, Second Department of Surgery, University of Cologne, Cologne, Germany

Titus Bach

Division of Trauma Surgery, Second Department of Surgery, University of Cologne, Cologne, Germany

Achim Münster, MD

Division of Trauma Surgery, Second Department of Surgery, University of Cologne, Cologne, Germany

Bertil Bouillon, MD

Division of Trauma Surgery, Second Department of Surgery, University of Cologne, Cologne, Germany

Thomas Tiling, MD

Division of Trauma Surgery, Second Department of Surgery, University of Cologne, Cologne, Germany

Our objective was to compare the effect of two meth ods of data collection on results in a functional knee score. Two Lysholm scores were obtained for 61 pa tients 1 year after anterior cruciate ligament surgery at the same clinic visit. First, the patients completed a self-administered questionnaire, and second, the Ly sholm score form was completed by the investigator in the course of a patient interview. A comparison of the scores revealed that the mean score was significantly lower with self-administration (self, 89.3 ± 10.6; inter viewer, 92.2 ± 7.4) (P = 0.0035, Wilcoxon rank sum test). The assignment to one of four categories (excel lent, good, fair, poor) was also significantly altered by the manner of data collection. Nineteen patients (31 %) were assigned to different categories based on the mode of data collection. We believe that the major reason for a better score result with an interview was the presence of interview bias. The more the investi gator is involved in the treatment of the patient, the greater the influence of this bias may be. To avoid such potential bias we suggest that a standardized self- administered questionnaire be used as the method of choice for obtaining subjective data in clinical settings.




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