Fig. 1

The unadjusted 28-day mortality at municipality level throughout the study period a 1987–1991, b 1992–1996, c 1997–2001, d 2002–2006, e 2007–2011, f 2012–2016. Note that the scales are different for each period due to the decrease in the national mean throughout the study period. The white colour encapsulates the mean across the 94 municipalities in each period. Thus, red colour indicates 28-day mortality above the national mean, and green colour indicates 28-day mortality below the national mean. Data on administrative boundaries were obtained from the Danish Agency for Data Supply and Efficiency