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Abstract

Reliability of measures of disease activity and disease damage in rheumatoid arthritis: implications for smallest detectable difference, minimal clinically important difference, and analysis of treatment effects in randomized controlled trials.

M N Lassere, D van der Heijde, K R Johnson, M Boers and J Edmonds
The Journal of Rheumatology April 2001, 28 (4) 892-903;
M N Lassere
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D van der Heijde
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K R Johnson
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M Boers
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J Edmonds
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Abstract

We evaluate measurement properties of common rheumatoid arthritis (RA) assessments. Included are a comprehensive literature review and new data on the reliability and smallest detectable difference (SDD) for different classes of these measures. We found that certain common measures such as joint counts, pain, and patient global all had poor reliability and showed large SDD compared to multi-item measures of physical/psychological function or compared to radiographic measures. We discuss the implications of these findings on the use of composite endpoints such as the ACR20 or the EULAR responder index in RA clinical trials, particularly the introduction of misclassification bias that arises from differential measurement error. Finally, we consider generically how the concept of the SDD might or might not relate to the concept of the minimal clinically important difference.

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The Journal of Rheumatology
Vol. 28, Issue 4
1 Apr 2001
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Reliability of measures of disease activity and disease damage in rheumatoid arthritis: implications for smallest detectable difference, minimal clinically important difference, and analysis of treatment effects in randomized controlled trials.
M N Lassere, D van der Heijde, K R Johnson, M Boers, J Edmonds
The Journal of Rheumatology Apr 2001, 28 (4) 892-903;

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Reliability of measures of disease activity and disease damage in rheumatoid arthritis: implications for smallest detectable difference, minimal clinically important difference, and analysis of treatment effects in randomized controlled trials.
M N Lassere, D van der Heijde, K R Johnson, M Boers, J Edmonds
The Journal of Rheumatology Apr 2001, 28 (4) 892-903;
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