Suzanne Humphries on public health: what the evidence says · JRE #2294
SUBJECT: PUBLIC HEALTH
Not a true/false call. Every claim is logged with its sources; read the exhibits below.
What we show in here, what other scientists have shown, is that it's about 3.5% of the contribution from medicine goes into our extended lifespan. 3.5% based on antibiotics, vaccines, et cetera. The rest of it was all about the revolution, the health revolution, the clean water, the shelter, the electricity, the child labor laws, you know, ending.
What the evidence says 01 / RECORD
The 3.5 percent figure traces to McKinlay and McKinlay (1977), "The Questionable Contribution of Medical Measures to the Decline of Mortality in the United States in the Twentieth Century," and the number itself is accurately quoted. In that paper the 3.5 percent is the combined contribution to the total US mortality decline from 1900 to 1973 of medical interventions against the five infectious diseases (influenza, pneumonia, diphtheria, pertussis, and poliomyelitis) where a mortality effect was even detectable, not a comprehensive accounting of all medicine's effect on modern lifespan. The authors' broader point (echoed by scholars like McKeown and Preston) is that most of the early mortality decline predated and was driven by sanitation, clean water, nutrition, and living conditions rather than clinical medicine, which is largely correct for the first half of the century. However, the framing that medicine accounts for only 3.5 percent of lifespan gains overall is misleading: it omits medical advances after 1973, understates mid-century antibiotics and vaccines, and the McKinlays themselves have called anti-vaccine use of their work an egregious misinterpretation, noting vaccines have an important role in containing disease. A 2020 Milbank follow-up reaffirms medicine's contribution is limited but stresses the precise share remains unresolved, with estimates ranging widely.