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Validity and responsiveness of the Dutch McMaster Toronto Arthritis Patient Preference Questionnaire (MACTAR) in patients with osteoarthritis.
Barten, D.J., Pisters, M., Takken, T., Veenhof, C. Validity and responsiveness of the Dutch McMaster Toronto Arthritis Patient Preference Questionnaire (MACTAR) in patients with osteoarthritis. Physiotherapy: 2011, 97(suppl. 1), p. S110-S111. Abstract. World Physical Therapy Congress, 22 juni 2011, Amsterdam.
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Purpose: To determine the content and construct validity as well as the responsiveness of the Dutch MACTAR in patients with osteoarthritis (OA) of the hip or the knee. Relevance: Monitoring a patients physical function in a patient-specific way. Participants: 172 (77% female) patients with osteoarthritis of the hip or the knee, mean age 64.6 years (7.9). Methods: The MACTAR comprises two parts: a transitional part and a status part. Content validity was investigated by matching patient-elicited activities to items of the ‘Western Ontario and McMaster Universities Osteoarthritis Index’ (WOMAC) and the ‘Medical Outcome Survey Short Form 36’ (SF-36). Analysis: Construct validity was determined by correlating MACTAR-outcomes to outcomes on the WOMAC and SF-36. Responsiveness was investigated by correlating MACTAR,WOMAC and SF-36 change scores and by sighting a Receiver Operating Characteristics Curve (ROC) curve. Results: Eleven percent of the 894 identified impaired activities by 172 patients, could not be matched with items of the WOMAC nor SF-36. Investigated correlations (rs) regarding the MACTAR-transitional part varied between .305 and −.327. Correlations concerning the status part differed between .423 and .430. Changes cores were correlated comparably. The area under the ROC-curve comprised .779. Conclusions: Our results suggest that the MACTAR exhibits moderate construct validity and reasonable responsiveness in a population of patients with OA of the hip or the knee. Furthermore, the MACTAR is potentially better able to detect changes over time in activities which are important to the individual patient than other tools measuring physical function (WOMAC, SF-36) can do. Implications: Therefore, the MACTAR could be used to detect patient-specific important impaired activities complemented to a disease-specific measurement tool. (aut.ref.)
Purpose: To determine the content and construct validity as well as the responsiveness of the Dutch MACTAR in patients with osteoarthritis (OA) of the hip or the knee. Relevance: Monitoring a patients physical function in a patient-specific way. Participants: 172 (77% female) patients with osteoarthritis of the hip or the knee, mean age 64.6 years (7.9). Methods: The MACTAR comprises two parts: a transitional part and a status part. Content validity was investigated by matching patient-elicited activities to items of the ‘Western Ontario and McMaster Universities Osteoarthritis Index’ (WOMAC) and the ‘Medical Outcome Survey Short Form 36’ (SF-36). Analysis: Construct validity was determined by correlating MACTAR-outcomes to outcomes on the WOMAC and SF-36. Responsiveness was investigated by correlating MACTAR,WOMAC and SF-36 change scores and by sighting a Receiver Operating Characteristics Curve (ROC) curve. Results: Eleven percent of the 894 identified impaired activities by 172 patients, could not be matched with items of the WOMAC nor SF-36. Investigated correlations (rs) regarding the MACTAR-transitional part varied between .305 and −.327. Correlations concerning the status part differed between .423 and .430. Changes cores were correlated comparably. The area under the ROC-curve comprised .779. Conclusions: Our results suggest that the MACTAR exhibits moderate construct validity and reasonable responsiveness in a population of patients with OA of the hip or the knee. Furthermore, the MACTAR is potentially better able to detect changes over time in activities which are important to the individual patient than other tools measuring physical function (WOMAC, SF-36) can do. Implications: Therefore, the MACTAR could be used to detect patient-specific important impaired activities complemented to a disease-specific measurement tool. (aut.ref.)