<qa>  What is the difference in HeQoL between groups?Statistics study B. Data are registered at a categorial scale and described as mentioned in study A for non-normally distributed data. Wilcoxons sign rank test is used to test the difference in HeQoL between the groups.When testing 3 or more groups, Friedmans test is applied. Spearmans Rho is used for correlation analyses of non-normally distributed data. Associations between variables are reported as ORs and 95 CI. 