Table 3:

Separate longitudinal mixed models predicting longitudinal change in stair climb time, significant interactions^*

	BMI Interaction	Health Status Interaction	Diabetes Interaction	Osteoarthritis Interaction
Model Parameters	Estimate (95% CI)	Estimate (95% CI)	Estimate (95% CI)	Estimate (95% CI)
Intercept (Seconds)	18.99 (17.73, 20.33)	19.02 (17.76, 20.37)	18.99 (17.73, 20.33)	19.03 (17.77, 20.37)
Time (Effect per year)	−0.99 (−1.62, −0.36)	0.86 (0.70, 1.02)	0.90 (0.74, 1.06)	0.84 (0.67, 1.02)
Main Effect	0.76 (0.56, 0.96)	6.65 (1.99, 11.32)	5.80 (−0.04, 11.64)	6.96 (3.44, 10.48)
Interaction	0.06 (0.04, 0.08)	0.81 (0.35, 1.28)	0.84 (0.22, 1.46)	0.48 (0.12, 0.84)

^*Adjusted for all factors included in Table 2, Model 4, including site, age, race, physical activity, difficulty paying for basics, health status, BMI, current smoking, diabetes, stroke, and osteoarthritis.

Note: Beta estimates for all parameters (except intercept) were multiplied by 100 to interpret as percentage difference in stair climb time. Negative coefficients indicate lower stair climb time, and thus better performance (i.e. faster), while positive values indicate slower stair climb time.