TABLE 2.

Association between normal gait speed and sleep problems estimated by multivariable linear regression.

Variables		Full modela	Model stratified by sexb
		Total (95% CI)	Male (95% CI)	Female (95% CI)
Age	Older vs. Middle	0.549 [0.492, 0.606]	0.534 [0.455, 0.612]	0.547 [0.463, 0.631]
Marital	Yes vs. No	−0.315 [−0.392, −0.238]	−0.318 [−0.438, −0.199]	−0.303 [−0.404, −0.203]
Education years		−0.022 [−0.029, −0.016]	−0.018 [−0.028, −0.009]	−0.028 [−0.037, −0.019]
Sex	Male vs. Female	0.104 [0.036, 0.172]	–	–
Smoking	Yes vs. No	0.007 [−0.027, 0.043]	−0.002 [−0.042, 0.038]	0.105 [0.007, 0.203]
Alcohol	Yes vs. No	−0.031 [−0.092, 0.030]	−0.031 [−0.103, 0.041]	−0.043 [−0.160, 0.074]
Physical activity level	High vs. Low	−0.161 [−0.212, −0.110]	−0.165 [−0.237, −0.093]	−0.145 [−0.217, −0.073]
Setting	Urban vs. Rural	0.032 [−0.021, 0.086]	0.085 [0.007, 0.164]	−0.026 [−0.099, 0.047]
Disease		0.164 [0.138, 0.191]	0.163 [0123, 0.202]	0.166 [0.129, 0.203]
BMI		0.007 [0.002, 0.012]	0.009 [0.001, 0.016]	0.006 [−0.001, 0.012]
Normal walking speed
Poor sleep quality	Yes vs. No	0.356 [0.185, 0.527]***	0.627 [0.341, 0.913]***	0.190 [−0.021, 0.403]
Sleep duration	7–8 h	ref	ref	ref
	<7 h	−0.005 [−0.064, 0.054]	0.001 [−0.091, 0.075]	−0.004 [−0.087, 0.079]
	>8 h	0.141 [0.078, 0.205]***	0.210 [0.121, 0.297]***	0.058 [−0.033, 0.150]

*p < 0.05; **p < 0.01; ***p < 0.001.

^aThe adjusted model included age, sex, education years, setting, alcohol consumption, smoking, number of diseases, physical activity, BMI, and sleep duration.

^bThe adjusted model included age, education years, setting, alcohol consumption, smoking, number of diseases, physical activity, BMI, and sleep duration.