Statistical Analyses
Statistical analyses were performed using the Statistical Package for the Social Sciences for Windows (SPSS version 22,0; IBM Corp, Armonk, NY, USA). The relationship between clinical and olfactory outcomes was analyzed through non-parametric test using Spearman correlation for scale data, Khi2 test for ordinal data and Mann-Whitney or Kruskal-Wallis test for categorized data. We investigated all potential associations between nasal complaints (nasal obstruction, rhinorrhea, postnasal drip) and the occurrence of olfactory disorder (sniffin’stick test). A level of significance of p<0.05 was used.