Trends in annual percent death according to age groups for SSc and non-SSc causes, 1968–2015. The percentage of total deaths for each year from 1968 to 2015 in the four age groups was calculated for SSc and non-SSc causes. Data are displayed per calendar year of death, with lines fitted on the basis of joinpoint analysis. Numbers on each panel denote the average annual percent change (95% CI) for SSc and non-SSc deaths. *P < 0.05 for slope change