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.
| Variable | Estimate | p |
|---|---|---|
| Group (0 = PsC, 1 = PsA) | 1.29642 | 0.013 |
| Sex (0 = female, 1 = male) | −1.19040 | 0.009 |
| EQ-5D anxiety component | 1.35326 | 0.019 |
| EQ-5D final | −4.43332 | 0.020 |
| FACIT-fatigue | −0.05761 | 0.025 |
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.