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Where next for China?: Keep to the basic principles of critical appraisal

BMJ 2006; 333 doi: (Published 31 August 2006) Cite this as: BMJ 2006;333:499
  1. Carl J Heneghan, clinical research fellow (
  1. Centre for Evidence-Based Medicine, Department of Primary Health Care, University of Oxford, Oxford OX3 7LF

    EDITOR—In the review by Liu et al of treatment of hyperbaric oxygen, several methodological issues need to be addressed.1 Alternate allocation to treatment group, or methods based on patient characteristics such as date of birth, order of entry into the clinic, or day of clinic attendance are not reliably random. …

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