Table 3.

Wilcoxon rank-sum test comparing the PSQI scores within each component of sleep quality in patients with PsA or PsC, and HC. Range for each variable is 0–3, except for PSQI, which is 0–21.

Duration of sleepPsC vs PsA0.5351PsC vs HC0.1837PsA > HC0.0425*
Sleep disturbancePsC < PsA0.0056*PsC > HC0.0005*PsA > HC< 0.0001*
Sleep latencyPsC < PsA< 0.0001*PsC vs HC0.2479PsA > HC0.0028*
Daytime dysfunction due to sleepinessPsC < PsA0.0091*PsC vs HC0.2035PsA > HC< 0.0001*
Sleep efficiency**PsC vs PsA0.4434PsC > HC0.0029*PsA > HC< 0.0001*
Need for sleep medicationsPsC vs PsA0.2072PsC vs HC0.4646PsA > HC0.0474*
Patient-perceived sleep qualityPsC < PsA0.0034*PsC vs HC0.8905PsA > HC0.0011*
PSQI scorePsC < PsA< 0.0001*PsC > HC0.0069*PsA > HC< 0.0001*
  • * Statistical significance was defined as p < 0.05.

  • ** Sleep efficiency was calculated by the following formula and appropriately scored: (total no. hours asleep)/(total no. hours in bed) × 100. PSQI: Pittsburgh Sleep Quality Index; PsA: psoriatic arthritis; PsC: psoriasis without arthritis; HC: healthy controls.