Figure 2.

Univariable linear regression model of participants (A) as well as participating households (B) from each German federal state in dependence of human inhabitants given in millions. Line fits represent linear regression and 95% confidence interval. R = Spearman correlation coefficient, p = associated p-value, BB = Brandenburg, BE = Berlin, BW = Baden-Württemberg, BY = Bavaria, HE = Hesse, HB = Bremen, HH = Hamburg, MV = Mecklenburg-Western Pomerania, NI = Lower Saxony, NW = North Rhine-Westphalia, RP = Rhineland-Palatinate, SH = Schleswig-Holstein, SL = Saarland, SN = Saxony, ST = Saxony-Anhalt, TH = Thuringia.