COPD maintenance trials use heterogeneous outcomes and measurement instruments: a systematic literature review
Abstract
Background: Randomised controlled trials (RCTs) of COPD management assess heterogeneous outcomes with diverse instruments and often omit those important to patients and healthcare professionals, limiting interpretability and comparability. This review aimed to identify the outcomes and instruments used in phase III/IV COPD maintenance management RCTs and assess their consistency.
Methods: We systematically reviewed all phase III/IV RCTs registered on ClinicalTrials.gov between 2010 and 2025 evaluating COPD maintenance management. Outcomes and measurement instruments were extracted from registry entries and categorised using the COMET (Core Outcome Measures in Effectiveness Trials) taxonomy. Registered outcomes from a random 10% sample were compared with the corresponding publications to assess concordance. Outcome frequencies were summarised across intervention types and sponsor categories.
Results: 43 unique outcomes were identified across 240 eligible RCTs. Physiological (89.5%), clinical (85.0%) and life impact outcomes (63.8%) were most frequently assessed, whereas resource use (39.6%), safety (36.7%) and mortality (16.7%) outcomes were less commonly reported. Only lung function (76.3%) and health-related quality of life (57.5%) appeared in over half of the trials. Exacerbations were reported in 40.4% of studies, while several patient-prioritised outcomes, particularly activities of daily living (5.4%) and exercise tolerance (18.3%), were infrequently assessed.…
How strong is the evidence?
Evidence Hub reads this as a systematic review, done in people. Its evidence level is 1 of 5 (Highest · pooled evidence). Pooled evidence from several studies sits at the top of the evidence pyramid.
Read the paper
Related studies
- Understanding the factors influencing fall armyworm (Spodoptera frugiperda J.E. Smith) damage in African smallholder maize fields and quantifying its impact on yield. A case study in Eastern Zimbabwe
- Alarming situation of emerging H5 and H7 avian influenza and effective control strategies
- Livestock and food security: vulnerability to population growth and climate change
- Atmosphere–ocean oxygen and productivity dynamics during early animal radiations
- Characterization of the global distribution and diversified plasmid reservoirs of the colistin resistance gene mcr-9
- The global seroprevalence of Toxoplasma gondii in pigs: A systematic review and meta-analysis
Go deeper in Evidence Hub
Evidence Hub adds a study data sheet (design, sample size, evidence level, key numbers), an AI summary and a chat grounded in the paper's text.