Known-Groups Validity (Table 3)
Kruskal-Wallis test revealed significantly different UCT scores at different strata of disease severity established by the CDLQI for patients with CU (P<0.01), CSU (P<0.01), and CIndU (P=0.02) at study entry. Subgroup analysis of patients aged 4 to 16 years yielded similar results (P<0.01).