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.

Variable	Comparison	p	Comparison	p	Comparison	p
Duration of sleep	PsC vs PsA	0.5351	PsC vs HC	0.1837	PsA > HC	0.0425^*
Sleep disturbance	PsC < PsA	0.0056^*	PsC > HC	0.0005^*	PsA > HC	< 0.0001^*
Sleep latency	PsC < PsA	< 0.0001^*	PsC vs HC	0.2479	PsA > HC	0.0028^*
Daytime dysfunction due to sleepiness	PsC < PsA	0.0091^*	PsC vs HC	0.2035	PsA > HC	< 0.0001^*
Sleep efficiency^**	PsC vs PsA	0.4434	PsC > HC	0.0029^*	PsA > HC	< 0.0001^*
Need for sleep medications	PsC vs PsA	0.2072	PsC vs HC	0.4646	PsA > HC	0.0474^*
Patient-perceived sleep quality	PsC < PsA	0.0034^*	PsC vs HC	0.8905	PsA > HC	0.0011^*
PSQI score	PsC < PsA	< 0.0001^*	PsC > HC	0.0069^*	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.