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Table 1 Distributional Characteristics of Total DLQI Score at Baseline for Studies A and B

From: Minimal Important Difference (MID) of the Dermatology Life Quality Index (DLQI): Results from patients with chronic idiopathic urticaria

Item N Floor (%) Ceiling (%) Mean SD Cronbach's Alpha SEM
Study A        
Symptoms/Feelings 403 0.25 11.66 3.49 1.49 . .
Daily Activities 403 24.07 3.72 1.92 1.69 . .
Leisure 403 37.72 3.72 1.46 1.64 . .
Work and School 403 27.05 15.14 1.21 1.01 . .
Personal Relationships 403 53.85 2.73 1.04 1.53 . .
Treatment 403 63.03 3.23 0.52 0.79 . .
Total DLQI 403 2.98 0.25 9.64 6.19 0.87 2.24
Study B        
Symptoms/Feelings 423 0.24 9.69 3.48 1.39 . .
Daily Activities 423 23.88 2.84 1.84 1.60 . .
Leisure 423 37.35 4.02 1.38 1.56 . .
Work and School 423 30.97 16.08 1.15 1.04 . .
Personal Relationships 423 53.19 2.36 0.96 1.39 . .
Treatment 423 62.65 2.84 0.51 0.76 . .
Total DLQI at Baseline 423 0.24 0.47 9.32 5.61 0.84 2.24
  1. Floor = percent who answered minimum value. Ceiling = percent who answered maximum value.