a decreasing trendp < 0.001
Trend by age groups Throughout the entire study period, all age groups showed a decreasing trend in AAIR, in which the steepest decline belonged to the oldest age group, 85 + years (AAPC − 7.7, 95% CI: − 8.5 to − 7.1, p < 0.001), while the lowest rates were calculated for the 40- to 44-year age group (AAPC–− 1.8, 95% CI: − 4.3 to − 0.8, p = 0.188) (Fig. 1 ).