. Author manuscript; available in PMC: 2025 Jun 10.

Published in final edited form as: J Gerontol A Biol Sci Med Sci. 2000 Apr;55(4):M221–M231. doi: 10.1093/gerona/55.4.m221

Table 2.

Adjusted Relative Risk of Developing ADL Disability According to Baseline Summary Performance Score

	n with Disability/Total n
	Summary Performance Scores			Relative Risk (95% CI)
Site (Follow-up Time)	4–6	7–9	10–12	4–6 vs 10–12	7–9 vs 10–12
Iowa (1 y)	14/182	14/570	6/590	5.1 (1.8–14.3)	2.0 (0.7–5.3)
New Haven (1 y)	9/104	5/279	3/272	7.4 (1.8–30.5)	1.5 (0.3–6.3)
Iowa (4 y)	43/146	51/506	29/523	4.5 (2.6–8.0)	1.5 (0.9–2.5)
North Carolina (4 y)	48/194	33/440	19/328	4.0 (2.2–7.2)	1.2 (0.6–2.1)
New Haven (6 y)	23/65	29/192	23/198	3.4 (1.7–7.1)	1.2 (0.7–2.2)

Notes: Relative risks adjusted for age, sex, number of chronic conditions. Higher summary performance scores denote better performance on tests. Subjects with scores of 10–12 serve as the reference group. CI = confidence interval.