Table 2.

Regression Results for Gait Parameters for the Full Age Range, and by Age Group, for Humans and Mice

Full Age Range		Gait Speed		Step Length		Cadence
Species × age2	p	.1665		<.0001		.0265
Age2	p	.0003		<.0001		.0045
Species	p	.2268		<.0001		.6308
By age group		Younger	Older	Younger	Older	Younger	Older
Age (humans)	β	NS	−0.0018	NS	−0.0019	NS	NS
	p	NS	<.0001	NS	<.0001	NS	NS
Age (mice)	β	−0.0026	−0.0034	NS	NS	NS	−0.6016
	p	.0885	.0736	NS	NS	NS	.0226

Note: Effect of age² is tested for the full age range model due to observed nonlinear LOWESS fit curves (Figure 1). Effect of age is further tested by age group (Younger: <65; and Older: >65 maximal life expectancy) for each species.

NS = Nonsignificant; β = Standardized coefficient; p = p value (marginal significant: .05< p < .10; significant p < .05).