Table 4. Logistic regression analysis of the associated factors for discontinuation of hypnotics using PSQI sub-item scores as explanatory variables.

PSQI sub-item	Univariate odds ratio (95% CI)	p	Multivariate odds ratio (95% CI)	p
C1: sleep quality	12.1 (4.9–29.5)	<0.01	8.4 (2.4–30.0)	<0.01
C2: sleep latency		ns		ns
C3: sleep duration	2.2 (1.1–4.4)	<0.05	3.6 (1.1–11.5)	<0.05
C4: habitual sleep efficiency	8.7 (3.7–20.5)	<0.01	11.1 (3.6–33.9)	<0.01
C5: sleep disturbance		ns		ns
C6: use of sleeping medication	3.9 (2.5–6.0)	<0.01	3.4 (1.9–6.2)	<0.01
C7: daytime dysfunction	0.56 (0.3–1.0)	<0.05		ns

CI denotes confidence intervals.

ns =  not significant; PSQI =  Pittsburgh Sleep Quality Index.