Trials Register

Cochrane Airways Group Register of Trials (CAGR)


The CAGR is a unique database containing definite, probable and possible randomised controlled trials (RCTs) relevant to the Group's scope and topics. The CAGR is developed, maintained and administered by the Information Specialist at the Cochrane Airways editorial base as a resource for our review authors. References to trial reports are identified through systematic searches of bibliographic databases, and handsearching of journals and conference abstracts.  Here you can find full details of the search strategy used to identify studies.

Inclusion criteria

Before a reference is added to the CAGR, the title, abstract and keywords are checked by the Information Specialist and the record is coded as an RCT or CCT according to Cochrane's definition. If the study design is unclear from the information available, the record is retained in the CAGR until the full-text of the paper can be checked and the study design verified. The CAGR includes trials on asthma, COPD, sleep apnoea and bronchiectasis. Each reference is coded for condition so it is then possible to limit a search of the CAGR to the condition of interest e.g. asthma.

Access to the CAGR

For each new review and review update of interventions for asthma, COPD, sleep apnoea and bronchiectasis, the Information Specialist will conduct a search of the CAGR using a set of keywords agreed with the review author, and forward the results to the lead review author. The CAGR is also made available to a wider audience through the CENTRAL database on the Cochrane Library. For reviews on interstitial lung disease, pulmonary hypertension, chronic cough, or any other obstructive airways condition not covered by the CAGR, the Information Specialist will search CENTRAL, MEDLINE and EMBASE instead of the Register.

Pie chart to illustrate proportion of references on the Cochrane Airways Group Register by condition