SUPPLEMENTARY INFORMATION
FROM:
The Psychometric Properties of the Psoriasis Disability Index in United States Patients
Tamar Nijsten, Diane Whalley, Joel Gelfand, David Margolis, Stephen P McKenna and Robert S Stern
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Demographic and disease characteristics of the study population.
Table S2 (doc 34K)
The median (25th and 75th percentiles) of the Psoriasis Disability Index (PDI) and its subscales for each level of everyday life score.
Table S3 (doc 58K)
Correlation coefficients between the items of the Psoriasis Disability Index
Table S4 (doc 54K)
Fit to the Rasch model for the Psoriasis Disability Index and its subscales.
Table S5 (doc 53K)
Differential item functioning (DIF) across groups according to patients' characteristics.
