Table 1: Descriptive statistics.

Statistics Figure Lower 95%-confidence intervall Upper 95%-confidence intervall Positive- predictive value 0,82051 0,71723 0,89825 Negative- predictive value 0,78205 0,67414 0,86761 Sensitivity 0,79012 0,68537 0,87272 Specificity 0,81333 0,70669 0,89402