Table 3.

Adjusted Latent Growth Model of Walking Speed and Wealth, England 2002–2003 to 2006–2007

Growth Parameters	Estimate	95% CI
Intercept	0.765	0.749, 0.780
Intercept variance	0.025	0.021, 0.029
Slope	−0.014	−0.024, −0.004
Slope variance	0.007	0.005, 0.009
Intercept regressed on
Baseline age, 71 y	−0.010	−0.010, −0.010
Wealth—middle	0.078	0.062, 0.094
Wealth—richest	0.162	0.142, 0.182
Slope regressed on
Baseline age, 71 y	−0.003	−0.003, −0.003
Wealth—middle	−0.015	−0.027, −0.003
Wealth—richest	−0.029	−0.043, −0.015
Model Fit	Estimate	Df
Chi-square test	4901.53	99
CFI	1.00
TLI	1.02
RMSEA	0.00
N	7,225

Notes: CFI = Comparative Fit Index; RMSEA = root-mean-square error of approximation; TLI = Tucker–Lewis index.

Results adjusted for sex, ethnicity, cohabitation status, number of close friends and/or family, depressive symptoms, coronary heart disease, diabetes, respiratory illness, arthritis, smoking status, physical activity. The variables have been mean centered, so that the reference category of each indicates the average conditions (except for sex and wealth).