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• Contamination in trials: is cluster randomisation the answer? 

  Cluster trials may not be the best way of preventing contamination between the control and intervention groups of a clinical trial. Cluster trials...

  British Medical Journal, 02/10/01 by David J Torgerson · More from publication

• Use of unequal randomisation to aid the economic efficiency of clinical trials 

  Doctors should consider using unequal randomization in clinical trials when there is a substantial difference in cost between the two treatments...

  British Medical Journal, 09/23/00 by David J Torgerson · More from publication

• Cost effectiveness calculations and sample size 

  Tips are presented to help doctors calculate the number of patients who would have to participate in a study to show whether a medical treatment is...

  British Medical Journal, 09/16/00 by David J Torgerson · More from publication

• Discounting 

  Until recently it has been common practice in economic evaluations to "discount" both future costs and benefits, but recently discounting benefits...

  British Medical Journal, 10/02/99 by David J. Torgerson · More from publication

• Randomisation methods: concealment 

  Randomisation is the best method removing selection bias between two groups of patients.[1] However, the process of randomisation can be...

  British Medical Journal, 08/07/99 by David J Torgerson · More from publication

• What is Zelen's design? 

  When patients do not receive their preferred treatment in When patients do not receive their preferred treatment in randomised trials there may be...

  British Medical Journal, 02/21/98 by David J. Torgerson · More from publication

• What is a patient preference trial? 

  A common problem in randomised controlled trials arises when patients (or their clinicians) have such strong treatment preferences that they refuse...

  British Medical Journal, 01/31/98 by David J. Torgerson · More from publication