MATERIALS AND METHODS
Local ethics committee aproval was obtained before the study. Nine
centers from various regions of Turkey were included in the study. The
data of 457 patients that underwent surgery for kidney tumor in the
2-year period between March 1, 2019 and February 28, 2021 were
retrospectively analyzed. The period between March 1, 2019 and February
28, 2020 was defined as 1-year period before COVID-19. The period
between March 1, 2020 and February 28, 2021 was defined as 1-year period
during COVID-19.
STATISTICAL ANALYSES
Statistical analyses were done with IBM SPSS (Statistical Package for
the Social Sciences) version 15.0 program. The conformity of the
variables to the normal distribution was examined using the
Kolmogorov-Smirnov (K-S) test. It was observed that all parameters
showed non-normal distribution and were analyzed by using non-parametric
tests. The Mann-Whitney U test was used to compare paired groups.
Pearson’s Chi-square test was used for multivariate comparisons. Results
were considered statistically significant when p<0.05.