Study population
In total, 3102 representative residents (1512 men, 1590 women) from the 16 German federal states who were over 18 years of age (mean 50.3 ± 17.7) were interviewed. The sample was taken from the ADM Pool for Telephone Samples (ADM = Arbeitskreis der deutschen Markt- und Sozialforschungsinstitute – a study group of German market and social research institutions). The ADM pool is a precisely coordinated national sample based on all possible telephone numbers that forms the basis for selecting population samples in the Federal Republic of Germany. The sample drawing was stratified according to age and gender, and the sample was weighted afterwards to the German population (year 2013) by federal state, residential density and household size according to the data from the National Federal Statistical Office. The over- all response rate for the study sample was 13%. Based on the aims of the current study, we only included