Table 5.

Regression models predicting gait speed using objective and subjective sleep measures that are independently significant (n = 587)

	Model 1	Model 2a	Model 3b	Model 4c
Covariates
Age	.09***	.10***	.09***	.10***
Female	.33	.56	.48	.68
Persons of color	1.71***	1.48***	1.48***	1.30**
Disease burden	.52***	.47***	.50***	.47***
Married	−.49	−.35	−.35	−.25
Obesity	.48	.65	.51	.67*
Education	−.59**	−.60**	−.52*	−.55*
Time lag (months)	.02	.01	.02	.02
Objective sleep
WASO			.64*	.64*
Subjective sleep
PSQI		.18**		.15*
R 2	.3146	.3416	.3236	.3495
Change in R2		.0136	.0090	.0088
F for (change in) R2	20.60***	7.84**	5.27*	5.52*

Note. WASO = wake after sleep onset. PSQI = Pittsburgh Sleep Quality Index. For interpretability, WASO was converted to 30-minute units.

^aModel 2 R² values reflect the change from Model 1 to Model 2.

^bModel 3 R² values reflect the change from Model 1 to Model 3.

^cModel 4 R² values reflect the change from Model 3 to Model 4.

^***p < .001

^**p< .01

^*p<.05.