Treatment-related improvement in physical function varies with duration of rheumatoid arthritis: a pooled analysis of clinical trial results.

Abstract:

BACKGROUND:Physical function in rheumatoid arthritis (RA) has reversible and irreversible components, and is typically assessed by the Health Assessment Questionnaire Disability Index (HAQ). Since irreversible components are expected to increase with longer duration of RA and reduce the ability for improvement in physical function, we analysed responsiveness of HAQ scores in patient populations with differing RA durations in randomised controlled trials (RCTs). METHODS:Data from all RCTs published between 1980 and 2005 that reported changes from baseline in HAQ at 6 and/or 12 months were analysed. Treatments were grouped as "biologics", or "traditional" disease modifying antirheumatic drugs (DMARDs), and "placebo". We computed effect sizes of HAQ in each trial, and contrasted the association between these effects and duration of RA among treatment groups using regression models. RESULTS:We identified 42 RCTs with complete data for the statistical models. The models indicate that discrimination of functional improvement between active drug groups and placebo is reduced in patients with a longer duration of RA (p = 0.02 for the change in discrimination over time). The placebo-adjusted HAQ responses decreased on average by 0.37 per year of RA duration. CONCLUSION:Responsiveness in HAQ scores is inversely associated with mean disease duration in RA. This impacts assessment of physical function, a key outcome measure in RCTs and practice, and impacts the ability to discriminate active treatment from placebo.

journal_name

Ann Rheum Dis

authors

Aletaha D,Strand V,Smolen JS,Ward MM

doi

10.1136/ard.2007.071415

subject

Has Abstract

pub_date

2008-02-01 00:00:00

pages

238-43

issue

2

eissn

0003-4967

issn

1468-2060

pii

ard.2007.071415

journal_volume

67

pub_type

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