Cochrane Pregnancy and Childbirth's Trials Register

The editorial team of Cochrane Pregnancy and Childbirth assembles, maintains and administers centrally a Trials Register as a service to the review authors who are preparing reviews with us.

The CPC Trials Register is a database created to assist members of Cochrane Pregnancy and Childbirth and currently contains more than 34,000 records referring to completed or ongoing trials, with an annual accrual rate of about 1500 new records. These trial reports are identified by the formal search methods (click for full details) or by informal discovery.

Search results are screened by two people at the editorial base and the full text of all relevant trial reports identified is reviewed. Based on the intervention described, each trial report is assigned a number that corresponds to a specific Pregnancy and Childbirth review topic (or topics), and is then added to the Register. Our Information Specialist Lynn Hampson ( searches the Register for each review using the Group's topic list rather than keywords. 

Cochrane Pregnancy and Childbirth's Trials Register inclusion criteria

TOPIC SCOPE: Controlled trials comparing alternative forms of care used either during pregnancy (but not to terminate early pregnancy), or within 28 days of delivery.

STUDY DESIGN: A controlled trial has been defined as a trial involving humans in which allocation to the intervention has either been at random, or by some quasi-random method, such as by alternation, or on the basis of the case record number or date of birth.

These criteria have been applied fairly liberally to avoid excluding potentially useful studies involving concurrent comparisons of alternative policies. In other words, the Register includes reports which, if necessary, can subsequently be rejected as methodologically inadequate by a member of the Group preparing a systematic review.