Figure 9.

Correlation between self-estimated expertise as a surgeon and the number of minimally invasive operations performed as a surgeon. Due to a nonlinear correlation, a Loess fitting curve (85% of the values) was calculated. This curve approximates a logarithmic curve (see curved dotted line). If this curve is used as a basis and interindividual scattering is suspected, a range of 500–1500 (see vertical broken lines) operations may be used as a prerequisite for an expert (limit 80%, see horizontal broken line).