John Snow
John Snow (1813-1858), English physician. Pioneer of anaesthesia and epidemiology. Defined etherization stages and traced cholera outbreaks to contaminated water in London.
Tag Epidemiology
Medmastery: PPV and Specificity
Franz Wiesbauer looks at the impact of specificity and sensitivity on positive predictive value (and thus validity of a test) and why one has a bigger impact than the other.
Medmastery: Mortality rate
Franz Weisbauer explains how to calculate mortality rates for various subgroups, proportionate mortality, and why proportionate mortality is not a measure of risk.
Medmastery: prognosis and life tables
Franz Wiesbauer explains how to express prognosis with the help of life tables and why this is essential to understanding Kaplan Meier curves.
Medmastery: PPV and prevalence
Franz Wiesbauer looks at how a doctor can work out the probability of disease when confronted with a positive or a negative test result and how the prevalence of a given disease affects this probability.
Just Read the Map
John Snow (1813-1858) was one of the first anaesthetists – he even chloroformed Queen Victoria! – but today he is famous for his investigation of the 1854 Broad Street cholera outbreak in Soho, London. By mapping the cases of cholera…