Table 1.

Adjusted odds ratios from the multivariable logistic regression models predicting meaningful declines in ADL, IADL, and mobility abilities among the 5,656 Survey on Assets and Health Dynamics among the Oldest Old (AHEAD) participants with complete data

Independent Variables	Decline in ADL Abilities	Decline in IADL Abilities	Decline in Mobility Abilities
Baseline Function
ADL Count	0.782***
IADL Count		0.690***
Mobility Count			0.370***
Exposure Adjustments
Centered Years Between Interviews	1.194***	1.224***	1.149***
Centered Years Between Interviews Squared	1.013***	1.008*	0.995
Respondent Status Adjustments
T1Self--T2Proxya	6.101***	18.620***	4.151***
T1Proxy--T2Selfa	0.170***	0.512	0.637
T1Proxy--T2Proxya	4.343***	7.165***	2.743***
Respondent Status with Baseline Function Interaction Terms
Baseline Function with T1Self--T2Proxy	0.850	0.570***	0.721***
Baseline Function with T1Proxy--T2Self	1.372	0.979	0.746
Baseline Function with T1Proxy--T2Proxy	0.772*	0.687**	0.736*
Health Lifestyles
Engages in Vigorous Activity	0.767***	0.637***	0.634***
Obeseb	0.989	1.128	1.441***
Underweightb	0.940	1.061	0.820
Current Cigarette Smokerc	0.788	1.185	1.792***
Former Cigarette Smokerc	0.951	1.077	1.059
≤ 1 Alcoholic Drink Daily	0.897	0.839	0.778*
Continuity of Care
Daily After Baselined	0.819	0.837	0.891
Never After Baselined	1.017	1.023	1.058
Post-Baseline Hospitalizations
Nonee	0.481***	0.362***	0.391***
0.01 to 0.23 Annuallye	0.581***	0.465***	0.545***
0.24 to 0.50 Annuallye	0.669***	0.708***	0.867
Managed Care Status
Ever In Managed Care	0.975	1.131	1.165
Terminal Drop
Died within 1 Yearf	1.698***	3.105***	1.635***
Died after 1 Yearf	1.221	2.475***	1.214
Model Fit Statistics
Area Under the Curve (C statistic)	0.767	0.849	0.817

Adjusted for age, sex, race, marital status, education, income, a set of 10 binary indicators for whether the participant had ever been told by a physician that she had particular diseases, a binary indicator of 3 or more of the diseases tapping comorbidity, vision, hearing, and post-baseline primary care physician visits.

* = p < 0.05; ** = p < 0.01; *** = p < 0.001

^aReference category is T₁Self--T₂Self.

^bReference category is normal weight or overweight.

^cReference category is never having smoked cigarettes.

^dReference category is continuity of care for 1-99% of days post-baseline.

^eReference category is ≥ 0.51 annual hospital episodes.

^fReference category is surviving to the end of the follow-up period.