Table 4.

Multivariate analysis by logistic regression

	β	SE	p value	OR (95% CI)
Poor sleep quality (PSQI ≥ 8.5) as a dependent variable
All subjects (n = 115)
Depression (BDI-II ≥ 14)	1.618	0.469	0.001	5.043 (2.012–12.640)
Leukopenia	–1.475	0.512	0.004	0.229 (0.084–0.625)
Pilocarpine usage	1.031	0.450	0.022	2.804 (1.160–6.779)
Subjects without depression (n = 71)
Unsatisfactory symptom state (ESSPRI ≥ 5)	1.505	0.586	0.010	4.505 (1.428–14.214)
Ever-smoking	1.988	0.976	0.042	7.298 (1.078–49.422)
Subjects with depression (n = 44)
Leukopenia	–3.068	1.111	0.006	0.047 (0.005–0.410)
Age	0.120	0.050	0.017	1.128 (1.021–1.245)
Unsatisfactory symptom state (ESSPRI ≥ 5) as a dependent variable
Fatigue (FSS ≥ 4)	2.393	0.542	1.00 × 10–5	10.942 (3.784–31.635)
PGA, the 4th quartile	2.011	0.772	0.009	7.469 (1.645–33.915)
Poor sleep quality	1.162	0.513	0.023	3.197 (1.171–8.731)
PD usage	1.388	0.657	0.035	4.006 (1.105–14.526)

SE, standard error; OR, odds ratio; CI, confidence interval; PSQI, Pittsburgh Sleep Quality Index; BDI, Beck Depression Inventory; ESSPRI, European League Against Rheumatism (EULAR) Sjögren’s syndrome (SS) Patient Reported Index; FSS, fatigue severity score; PGA, patient global assessment for SS; PD, prednisolone.