Table 2. Descriptive statistics: proportions for categorical variables (%), mean (continuous variables), median (ordinal variables), median absolute deviation (MAD), and number of missing data per variable (n = 7,987).

Legend: ^a Information on diabetes type is supplied by the variable KHdiabtyp from the public use file. Note that the frequencies supplied in the variable KHdiab (yes = 671) differ from those of the KHdiabtyp variable (type I + type II diabetes = 677). In the present investigation, the variable KHdiab only is used in the regression analysis, as described in Table 1.