Normal Curves: Sexy Science, Serious Statistics Daylight Saving Time: Does springing forward cause heart attacks?
5 snips
Mar 9, 2026 They dig into headlines claiming daylight saving causes a 24% spike in heart attacks and trace that number back to the studies behind it. The hosts compare registry studies, a large meta-analysis, and a modern U.S. registry to show how methods shape results. They explain incidence ratios, relative versus absolute risk, negative controls, harvesting, and why dramatic numbers make better headlines than careful statistics.
AI Snips
Chapters
Transcript
Episode notes
Daylight Saving Started With A Bug Collector
- Daylight saving time's origin stories include a New Zealand bug collector George Hudson proposing shifted clocks for after-work insect collecting.
- William Willett later popularized it in England partly to play golf more in the evening.
Modern DST Dates Driven By Industry Lobbying
- U.S. DST dates changed for industry reasons over decades; 2007 moved start earlier and end later after lobbying from golf, candy, and theme park industries.
- Political and commercial forces, not solar biology, shaped modern timing.
Swedish NEJM Letter Found Tiny Spring Increase
- The 2008 Swedish registry letter found a small rise in heart attacks after spring DST, with an aggregate weekly incidence ratio of 1.05.
- Tuesday showed the largest jump (≈10%), but raw counts imply only about 20 extra heart attacks per spring change in Sweden over 15 years.