Daylight saving time affects European mortality patterns

Daylight saving time (DST) consists in a one-hour advancement of legal time in spring offset by a backward transition of the same magnitude in fall. It creates a minimal circadian misalignment that could disrupt sleep and homoeostasis in susceptible individuals and lead to an increased incidence of pathologies and accidents during the weeks immediately following both transitions. How this shift affects mortality dynamics on a large population scale remains, however, unknown. This study examines the impact of DST on all-cause mortality in 16 European countries for the period 1998-2012. It shows that mortality decreases in spring and increases in fall during the first two weeks following each DST transition. Moreover, the alignment of time data around DST transition dates revealed a septadian mortality pattern (lowest on Sundays, highest on Mondays) that persists all-year round, irrespective of seasonal variations, in men and women aged above 40. How daylight saving time shift (DST) affects mortality dynamics on a large population scale remains unknown. Here, the authors examine the impact of DST on all-cause mortality in 16 European countries for the period 1998-2012.

Automated summary

The study found that the transition of daylight saving time can affect the all-cause mortality rate in European countries, with a decrease in mortality in spring and an increase in mortality in fall. Additionally, the DST transition can lead to a change in the weekly mortality pattern.