Fig. 2.

Temporal change in age-standardized asthma prevalence in 402 districts, clustered into six trajectories, Germany, 2009–2016

Notes: We created trajectories using the SAS procedure Proc Traj,²² the optimal number of six, which was based on the Bayesian Information Criterion. The German population from the year 2015 was used as a standard population;¹⁹ the standardization controls for possible demographic changes in the population structure in the study period.