Personal Views Personal views

“Absolute” is inappropriate for quantitative risk estimation

BMJ 2000; 320 doi: https://doi.org/10.1136/bmj.320.7236.723 (Published 11 March 2000) Cite this as: BMJ 2000;320:723
  1. Hugh Tunstall Pedoe, professor of cardiovascular epidemiology.
  1. Dundee

    Risk prediction, risk management, and risk avoidance are in fashion and invading medical practice, but current terminology is unfortunate and tendentious in a clinical context. Gambling and life insurance led to the first mathematics of risk. Individual outcomes were unpredictable, but if the circumstances and rules of the game did not change, the long run odds could be estimated from previous experience.

    Longitudinal studies, of which the Framingham study was a pioneer, identified human risk factors which, when measured at the start of observation, correlated with the subsequently recorded risk. Risk is recorded as an event rate having numerator, denominator, and time period, but problems arose in how to portray different levels of risk at different levels of risk factors.

    “Absolute” risk…has misleading medicolegal and ethical implications

    For half a century relative risk was king. Dividing high risk by low produced a simple multiple with no units—relative risk of smoking = 2.5. Relative …

    View Full Text

    Sign in

    Log in through your institution

    Free trial

    Register for a free trial to thebmj.com to receive unlimited access to all content on thebmj.com for 14 days.
    Sign up for a free trial

    Subscribe