Letter

Randomised trials

Beware the “Texas sharp shooter” in rate ratios of progression

BMJ 2007; 334 doi: 10.1136/bmj.39136.475313.FA (Published 1 March 2007)
Cite this as: BMJ 2007;334:440.3

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  1. Anna C Goodman (anna.goodman@lshtm.ac.uk)
  1. London School of Hygiene and Tropical Medicine, London WC1E 7HT

    Glasziou et al's method of calculating rate ratios of progression (stable unchanging condition before v change shortly after the intervention) is appealing,1 but we need to be wary of a “Texas sharp shooter” effect. This effect is usually associated in epidemiology with the problem of interpreting apparent clusters …

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