Statistical analysis
Categorical variables are reported as numbers (percentages), and
continuous variables are reported as mean ± standard deviation (SD).
Continuous variables were tested for normal distribution using
histograms and Q-Q plots. Categorical variables were compared using
chi-squared test or Fisher’s exact test and continuous variables - by
Mann-Whitney test or t-test, as appropriate. Revision surgeries were
excluded from surgery type and tumor size analysis. A two-tailed
p<0.05 was considered statistically significant. Analyses were
performed with SPSS version 22 (IBM Corporation, Armonk, NY).