Pregnancy and Childbirth Group'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 members of the Group.

The PCG Trials Register was created to assist members of Cochrane Pregnancy and Childbirth and currently contains more than 20,000 records referring to completed or ongoing trials, with an annual accrual rate of about 800 new records. Reports are identified by the formal search methods or by informal discovery.

Trials identified through the searching activities are prospectively assigned to a review topic (or topics). Our Information Specialist, Lynn Hampson (, searches the register for each review using the Group's topic list rather than keywords. 

The PCG Trials Register is submitted quarterly for publication in CENTRAL in the Cochrane Library.  The Register can be searched in the Cochrane Library by adding 'and SR-PREG' to the end of your search strategy.

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.

Hard copies of all trial reports identified through the searching activities described are obtained and reviewed by the Information Specialist to see if they meet the eligibility criteria. Reports are then added to the register. On the basis of the health topic(s) and/or form(s) of care covered, every record in the register is assigned by the editorial team to one or more reviews.