Fig. 2
From: Nasal nitric oxide in allergic rhinitis in children and its relationship to severity and treatment
Pre- and post-treatment visual analog scale (VAS) scores of a rhinitis, b sneezing, c runny nose, d nasal congestion, and e nasal itchiness. Box plot consists of median (middle line), the P25 (bottom of the box) and the P75 (top of the box) percentiles. Mann–Whitney U test and Wilcoxon signed rank test are implemented to examine group difference at two time points and post-treatment changes of VAS scores for each group, respectively. Letter a denotes significant difference from mild group. Asterisk denotes significant change after treatment