Convergent Validity
When controlling for age and sex, UCT scores strongly correlated with CDLQI scores in CU (r=-0.74, P<0.01) and CSU (r=-0.72, P<0.01). A moderate correlation was observed in patients aged 4 to 16 years (r=-0.67, P<0.01). We were unable to assess the convergent validity of the UCT in CIndU patients because of inadequate sample size (N<25).