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Table 2 Score distributions, feasibility, and reliability of the UAS7 score

From: Psychometric properties of the Spanish version of the once-daily Urticaria Activity Score (UAS) in patients with chronic spontaneous urticaria managed in clinical practice (the EVALUAS study)

  Hives Itching UAS7
Baseline scores and distributions
 Mean (SD) 7.2 (5.8) 9.3 (5.6) 16.4 (10.5)
 Median (range) 7 (0-21) 8 (0-21) 15 (0-42)
Missing values; floor and ceiling effects, n (%)
 Missing 21 (12.7%) 21 (12.7%) 25 (15.1%)
 Minimum score (floor) 22 (13.3%) 9 (5.4%) 9 (5.4%)
 Maximum score (ceiling) 4 (2.4%) 6 (3.6%) 2 (1.2%)
Reliability
 Internal consistency assessed using Cronbach’s alpha (95% CI)a    0.83 (0.721 – 0.895)
 Test-retest reliability, asessed using ICC (95% CI)    0.84 (0.735 – 0.906)
  1. SD standard deviation, Min minimum, Max maximum, ICC Intraclass correlation coefficient. 95% CI 95% confidence interval. Missing values defined as number and proportion of patients with at least one missing response. aTest-retest reliability analysis performed in patients reporting no or minimal change in urticaria status at visit 2