Wouter Leclercq

Chapter 4 64 Statistical analysis All data were collected in an online database, checked for duplicates, and immediately rendered anonymous. Descriptive statistics were used to analyze the data. χ 2 or Fisher’s Exact tests (in the case of small numbers) were used to compare OS with PS surgeons and surgeons with residents. A P<0.05 was considered significant. Statistical analyses were performed using version 18 SPSS, Chicago, Illinois, USA.