Statistical analyses
Data were analysed with SPSS 19.0. Qualitative variables were reported
as absolute frequency and percentage, while quantitative variables were
reported as the mean and standard deviation or the median and
interquartile range if they did not fit a normal distribution. The
Kolmogorov–Smirnov test was used for normality testing. A univariate
analysis was performed to determine whether there were differences
between the two study groups. For the relationship with qualitative
variables, the Chi-square test was used, while for the comparison of
quantitative variables, the parametric t-test or the non-parametric
Mann-Whitney test was applied. Differences were considered statistically
significant at p < 0.05. Ethics committee approval for this
study was obtained from the Ethics and Clinical Research Committee of
Galicia (approval number 2020/617).