Which figure is credited with introducing inference into public health statistics?

• A. Hippocrates
• B. John Graunt
• C. William Farr
• D. Ignaz Semmelweis

Answer: (B)

Introducing inference into public health statistics means using counted data to draw broader conclusions about a population’s health. John Graunt did this by studying London’s Bills of Mortality in the 1660s. He didn’t just tally deaths; he organized the data by age, season, and cause and began calculating mortality rates and a life table. From these analyses, he inferred patterns about life expectancy and overall population health, showing that numbers can reveal underlying health trends rather than just recording events. This move from raw counts to meaningful health inferences is the seeds of modern epidemiology and vital statistics.

Hippocrates laid the groundwork in ancient times with medical theory, not statistical inference. Ignaz Semmelweis demonstrated how handwashing reduces puerperal fever, but didn’t introduce statistical inference. William Farr later advanced public health statistics by improving data collection and standardization; his work built on Graunt’s foundation, but Graunt is the one credited with first introducing the inferential use of health data.