. 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 3.

Equations Estimating Probability of Developing Disability in Mobility and Activities of Daily Living Over 1 Year and 4 Years in Survivors According to Age, Sex, and Performance

Measure of Performance	Years of Follow-up	Outcome (Type of Disability)	Probability of Disability^*
Summary score	1	Mobility	1/1+e−[−5.20 + 0.08(age) + 0.08(sex) − 0.31(SS)]
Summary score	1	ADL	1/1+e−[−8.03 + 0.10(age) − 0.18(sex) − 0.38(SS)]
Summary score	4	Mobility	1/1+e−[−5.61 + 0.09(age) + 0.21(sex) − 0.29(SS)]
Summary score	4	ADL	1/1+e−[−8.39 + 0.11(age) − 0.31(sex) − 0.29(SS)]
Gait speed	1	Mobility	1/1+e−[−7.00 + 0.09(age) + 0.10(sex) − 2.64(GS)]
Gait speed	1	ADL	1/1+e−[−10.76 + 0.12(age) − 0.15(sex) − 2.96(GS)]
Gait speed	4	Mobility	1/1+e−[−7.28 + 0.10(age) + 0.28(sex) − 2.36(GS)]
Gait speed	4	ADL	1/1+e−[−9.59 + 0.12(age) − 0.23(sex) − 2.81(GS)]

Sex = 0 for men, 1 for women; SS = summary performance score. GS = gait speed (in meters per seconds). ADL = activity of daily living. All coefficients are statistically significant ( p < .05) except for the sex coefficient, which is significant for only the model for gait speed predicting mobility loss at 4 years.