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. Author manuscript; available in PMC: 2015 May 6.
Published in final edited form as: Cochrane Database Syst Rev. 2012 Apr 18;4:CD003659. doi: 10.1002/14651858.CD003659.pub3

Table 1. Quality assessment.

Trial ID Method randomization Allocation conceal. Baseline compar. Attrition Intention-to-treat
Peach 1987 Unclear risk Unclear risk Low risk Unclear risk Unclear risk
West 1995 Low risk ? Low risk Unclear risk Low risk Low risk