Table 3. Correlations of age, disease duration, disease activity, dryness severity, pain, emotional state, and insomnia level with fatigue assessed by FACIT-F, FS, and ESSPRI fatigue in PSS patients.

	FACIT-F score		Fatigue subscale		ESSPRI fatigue
	Rho	p	Rho	p	Rho	p
Age (year)	-0.074	0.611	0.076	0.602	0.032	0.826
Disease duration (year)	-0.094	0.516	0.019	0.893	-0.010	0.944
Disease activity
ESSDAI	-0.304	0.032	-0.345	0.014	0.034	0.813
Dryness severity
Schirmer (mean)	0.085	0.556	0.015	0.919	-0.186	0.195
WUSFR	0.033	0.818	0.033	0.819	-0.131	0.364
Pain
Pain thresholds (mean)	0.169	0.241	0.212	0.139	-0.175	0.225
Number of painful body sites	-0.518	<0.001	-0.460	0.001	0.313	0.027
Pain DETECT questionnaire	-0.561	<0.001	-0.465	0.001	0.355	0.011
Emotional state
Beck Depression Inventory	-0.893	<0.001	-0.804	<0.001	0.582	<0.001
Beck Anxiety Inventory	-0.712	<0.001	-0.586	<0.001	0.449	0.001
Insomnia
Insomnia Severity Index	-0.554	<0.001	-0.483	<0.001	0.398	0.004
FACIT-F: Functional Assessment of Chronic Illness Therapy Fatigue; ESSPRI: EULAR Sjögren’s Syndrome Patient Reported Index; PSS: Primary Sjögren’s syndrome; ESSDAI: EULAR Sjögren’s syndrome disease activity index; WUSFR: Whole unstimulated salivary flow rate.