Fig. 4.

A Relative percentage of whole blood donations for the German Red Cross Blood Service and University and private blood services (all blood donations of a single blood donation service correspond to 100%). The different blood services in the state recruit different patient groups. While the Red Cross blood donation service primarily recruits donors in the age groups >30 years, the university-based and the private blood service primarily recruit donors <30 years of age. The figure shows the relative proportions of donors per age group of the different blood services. B Absolute number of whole blood donations for the German Red Cross Blood Service and University and private blood services. The Red Cross blood donation service obtains most blood donations in the state. The reduction in absolute donations between 2005 and 2015 is obvious for all blood services in the state.