Table 2.

Associations between sleep duration and cognitive frailty according to unadjusted and adjusted logistic regression models (n = 4093)

	Robust	Physical pre-frailty OR [95%CI], P-value	Physical frailty OR [95%CI], P-value	Cognitive impairment OR [95%CI], P-value	Cognitive frailty OR [95%CI], P-value
Unadjusted model
Sleep duration < 6 h	Reference	1.28 [1.03, 1.59], P = 0.023	1.33 [0.81, 2.22], P = 0.262	0.88 [0.54, 1.43], P = 0.597	1.07 [0.75, 1.51], P = 0.715
Sleep duration 6–8 h	Reference	Reference	Reference	Reference	Reference
Sleep duration ≥9 h	Reference	1.23 [1.03, 1.47], P = 0.020	1.82 [1.25, 2.66], P = 0.002	1.56 [1.13, 2.17], P = 0.008	2.23 [1.77, 2.80], P < 0.001
Adjusted modela
Sleep duration < 6 h	Reference	1.19 [0.95, 1.48], P = 0.137	1.06 [0.62, 1.82], P = 0.824	0.82 [0.49, 1.36], P = 0.438	0.88 [0.60, 1.28], P = 0.499
Sleep duration 6–8 h	Reference	Reference	Reference	Reference	Reference
Sleep duration ≥9 h	Reference	1.20 [1.0, 1.44], P = 0.049	1.70 [1.14, 2.54], P = 0.009	1.45 [1.03, 2.04], P = 0.032	2.07 [1.60, 2.68], P < 0.001

^a Model adjusted for age, gender, ethnicity, marital status, education, smoking history, drinking history, number of chronic diseases, depression. OR odds ratio; CI confidence intervals