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We examined whether there are advantages in terms of outcome assessment of using Rasch methods of scoring the 12-item Oxford Hip Score questionnaire over conventionally summed scores. Data were collected on patients receiving total hip replacement surgery. Three patient groups were created according to surgery type: primary, revision, and re-revision; two groups were created according to satisfaction with surgery: very satisfied and dissatisfied. Analyses were performed to test the relative precision (RP) of Rasch scoring versus conventionally summed scores in discriminating the groups experiencing different types of surgery and level of satisfaction. At the 1-year follow-up, RP ratios favored the Rasch scoring method in both tests of discrimination. Considerable gains in precision were achieved with Rasch scoring methods when groups were compared in a cross-sectional way. Alternative approaches to scoring questionnaires should be investigated to better assess comparisons over time.

Type

Journal article

Journal

J Clin Epidemiol

Publication Date

01/2003

Volume

56

Pages

68 - 74

Keywords

Activities of Daily Living, Adult, Aged, Aged, 80 and over, Arthroplasty, Replacement, Hip, Cross-Sectional Studies, Female, Follow-Up Studies, Health Status, Humans, Male, Middle Aged, Pain, Pain Measurement, Patient Satisfaction, Postoperative Period, Psychometrics, Quality of Life, Sensitivity and Specificity, Surveys and Questionnaires, Treatment Outcome