Table 5.

Final reduced model obtained from backward elimination after including variables with p < 0.2 from the univariate analysis of variables associated with PSQI in patients with PsD.

VariableEstimatep
Group (0 = PsC, 1 = PsA)1.296420.013
Sex (0 = female, 1 = male)−1.190400.009
EQ-5D anxiety component1.353260.019
EQ-5D final−4.433320.020
FACIT-fatigue−0.057610.025
  • Response variable: PSQI. A higher reported anxiety score reflects worse anxiety. A higher calculated EQ-5D score reflects a better quality of life. A higher calculated FACIT-fatigue score reflects less fatigue. PSQI: Pittsburgh Sleep Quality Index; PsD: psoriatic disease; PsA: psoriatic arthritis; PsC: psoriasis without arthritis; FACIT: Functional Assessment of Chronic Illness Therapy.