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Table 5 Variables, measurement instruments and data sources

From: Outcomes associated with matching patients' treatment preferences to physicians' recommendations: study methodology

Variable Measurement Instrument Data Source Data Collection Period
Independent Variable    
PMI Conjoint analysis survey/Doctors' recommendations Participants t 1
PMI Doctors' recommendations Participants' medical records t 1 , t 2 , t 3
Dependent Variable    
PASI scores Physician-assessed PASI [17] Participants' medical records t 1 , t 2 , t 3
TSQM scores Self-reported TSQM questionnaire [18] Participants t 1 , t 2 , t 3
DLQI scores Self-reported DLQI questionnaire [19] Participants t 1 , t 2 , t 3
Confounders    
Demographic factors Standard German demographic questionnaire Participants t 1
Sex
Age
Partnership
Living with a partner/living alone
Education
Highest educational attainment
Income
Net monthly household income
Number of household members
Employment status
Full-time
Part-time
Not working
   
Treatment factors Self-reported questionnaire Participants t 1
Currently receiving psoriasis treatment or not
Type of psoriasis treatment (topical, UV therapy, Tablets, injections/infusions)
   
Disease-related factors Self-reported questionnaire Participants t 1
Time since diagnosis
Co-morbidities
Psoriatic arthritis
Depression
Allergy
High blood pressure
Cardiovascular disease
Hyperlipidemia
Chronic lung disease, asthma
Liver disease
Diabetes
Cancer
   
  1. Note: DLQI = Dermatology Quality of Life Index; PASI = Psoriasis Area and Severity Index; TSQM = Treatment Satisfaction Questionnaire for Medication; t1 = initial study visit; t2 = first follow-up study visit twelve weeks after t1; t3 = second follow-up study visit twelve weeks after t2