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).