Table 2. Rate of decline in physical performance by baseline impairment status.

	Model 1		Model 2		Model 3
	Slope	P value	Slope	P value	Slope	P value
Intercept	30.32	<0.001	46.70	<0.001	10.40	<0.001
Overall decline	-0.76	<0.001	-0.50	<0.001	-0.70	<0.001
Baseline impairment
NI	Ref		Ref		Ref
PI	-7.25	<0.001	-5.59	<0.001	0.04	0.912
CI	-1.07	0.036	-1.16	0.021	-0.58	0.138
CPI	-8.42	<0.001	-6.92	<0.001	-0.71	0.102
Baseline impairment*Time
NI * Time	Ref		Ref		Ref
PI * Time	-0.29	0.164	-0.28	0.158	-0.25	0.294
CI * Time	-1.03	<0.001	-0.98	<0.001	-1.22	<0.001
CPI * Time	-1.09	<0.001	-1.04	<0.001	-1.17	<0.001

Notes: baseline impairment status is based on baseline PPT score (score of <28 being used as indication of physical impairment). NI = not impaired, PI = physically impaired but cognitively normal, CI = cognitively impaired but physically normal; CPI = cognitively and physically impaired; Performance on the PPT (score) was also used to measure decline in physical function; Model 1 = unadjusted; Model 2 = Model 1 + age + gender + education + race; Model 3 = Model 2 + baseline total PPT score; Rates of decline in physical performance were higher in the CI and CPI groups than in the NI (reference) group. No significant differences were observed in the PI group compared with the NI group.