Blikman, T. (2012) Test-hertest betrouwbaarheid en concurrente validiteit van de IPAQ bij totale heup- en kniepatiënten. thesis, Medicine.
Full text available on request.Abstract
Summary: Introduction: Due to an aging society and an increasing prevalence of obesity osteoarthritis is increasing, nowadays more often resulting in hip or knee replacement surgery (THA, TKA). Regular physical activity is important; it has proven to reduce morbidity and mortality and is associated with better prosthetic fixation. According to the international physical activity guidelines, a great part of the population is physically insufficiently active, especially the elderly. So far little is known about the physical activity pattern of patients after THA/TKA. For this reason several questionnaires have been developed, however none of them is (inter)nationally accepted, therefore (inter)national comparison is difficult. The International Physical Activity Questionnaire ( IPAQ) tries to solve this problem; the questionnaire is available in a short and long version. Yet it’s still unknown if the IPAQ is a reliable and valid measurement instrument within a THA and TKA population. Objective: To examine the test-retest reliability and concurrent validity of the short- and long version of the self-administered form of the IPAQ in a THA and TKA patient group. Methods: Test-retest reliability: Participants were visited twice, with an interval between 9 to 12 days. On both visits participants were asked to complete both, the short and long version of the IPAQ. Subsequently activity scores were calculated, as there were: total activity score, total time, time spent on walking, moderate- and vigorous activities. Test-retest reliability was assessed by calculating Spearman’s correlation coefficients and Intraclass coefficients (ICC) between the scores, on the two measurements, both for the short and long version. Additionally, Bland & Altman analyses were performed. Concurrent validity: To asses validity, scores retrieved from the short and long-IPAQ were compared with scores of an accelerometer (ActigraphTM GT1M). The accelerometers were worn on a belt around the subjects waist, between the first and second home visit. To express relative concurrent validity, Spearman’s correlation coefficients were calculated. Additionally, Bland & Altman analyses were performed. Results: Test-retest reliability: 44 patients participated (19 hip, 20 knee, 5 combination; average age:72±9, women: 77,3%). Reliability of the total activity score was high, for the total group and the hip and knee group apart, scores for the IPAQ-short version reached coefficients of respectively r=0.60, r=0.80 en r=0.48 (ICC: 0.51, 0.43, 0.34), for the long version scores reached respectively r=0.78, r= 0.86 en r=0.82 (ICC: 0.65, 0.65, 0.81). The other activity scores and sitting varied in test-retest reliability, for the short-IPAQ scores ranged between r=0.32 and r=0.78 (ICC: -0.01-0.69), within the long version scores ranged between r=0.32 and r=0.87 (ICC: 0.34-0.85). Bland & Altman analyses in the long version, showed a light systematic bias within the hip and knee group; however the total group showed no bias Concurrent validity: 42 patients were included (17 hip. 20 knee, 5 combination). Total activity score correlated highly with the accelerometer, for the short-IPAQ: total r=0.63, hip r=0.72, knee r=0.62; for the long-IPAQ: total r=0.52, hip r=0.78, knee r=0.32. For time spent in the activity categories moderate, vigorous and sitting, scores varied: ranging for moderate between r=0.18-0.55, vigorous r=0.44-0.68 and sitting r=0.01-0.20. Bland & Altman analyses showed high systematic bias within every category, with IPAQ scores being higher in comparison with the accelerometer. Conclusion: The IPAQ possesses a fair to good test-retest reliability and relative validity. Due to the high systematic bias between the IPAQ and accelerometer the absolute validity is limited. For this reason, it is advised not to use the IPAQ to determine precise amount of physical activity. For comparison of activity levels between groups, the IPAQ seems to be adequate. The long-IPAQ is preferred; it scores higher and more stable on test-retest reliability.
| Item Type: | Thesis (Thesis) |
|---|---|
| Supervisor name: | Stevens, Dr. M. and afd. Orthopedie UMCG |
| Supervisor name: | Reininga, Dr. I. afd. Orthopedie Martini ZKH |
| Faculty: | Medical Sciences |
| Date Deposited: | 25 Jun 2020 11:05 |
| Last Modified: | 25 Jun 2020 11:05 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/2459 |
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