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Table 2 Correlations Between the PSA Frequency and Severity Scores and the DLQI Total and Scale Scores and the Itch Measures, Baseline and Week 12

From: Validity and reliability of patient reported outcomes used in Psoriasis: results from two randomized clinical trials

  STUDY A STUDY B
  Baseline Week 12 Baseline Week 12
Scale/Subscale PSA Freq PSA Severity PSA Freq PSA Severity PSA Freq PSA Severity PSA Freq PSA Severity
DLQI Total Scale 0.59 0.61 0.78 0.79 0.62 0.63 0.78 0.79
   DLQI Symptoms and Feelings Subscale 0.62 0.64 0.83 0.84 0.66 0.68 0.83 0.84
   DLQI Daily Activities Subscale 0.44 0.46 0.65 0.67 0.48 0.48 0.68 0.69
   DLQI Leisure Subscale 0.38 0.40 0.60 0.61 0.43 0.44 0.61 0.60
   DLQI Work and School Subscale 0.45 0.48 0.58 0.60 0.41 0.40 0.55 0.54
   DLQI Personal Relationship Subscale 0.37 0.37 0.55 0.54 0.42 0.42 0.53 0.54
   DLQI Treatment Subscale 0.43 0.42 0.66 0.67 0.38 0.39 0.60 0.62
NPF Itch Scale n/a n/a n/a n/a 0.67 0.68 0.81 0.82
VAS Itch Scale 0.60 0.59 0.78 0.80 n/a n/a n/a n/a
  1. All correlations are significant at p < 0.001