Public transit stop density is associated with walking for exercise among a national sample of older adults

BMC Geriatrics

Table 3 Results from sequentially adjusted mediation analysis examining the extent to which public transit use mediates the association between number of public transit stops per square mile within a participant’s census tract and self-reported ever walking for exercise in the last month (n = 4,836)

	ACME Mean (95% CI)	ADE Mean (95% CI)	Total Effect Mean (95% CI)	% Total Effect Mediated Mean (95% CI)
Model 1	0.008 (0.006, 0.011)	0.009 (-0.008, 0.026)	0.017 (0.001, 0.035)	0.466 (0.196, 3.013)
Model 2	0.006 (0.004, 0.009)	0.026 (0.010, 0.042)	0.032 (0.016, 0.049)	0.200 (0.131, 0.406)
Model 3	0.005 (0.004, 0.007)	0.019 (0.001, 0.036)	0.024 (0.125, 0.664)	0.217 (0.127, 0.673)
Model 4	0.004 (0.003, 0.006)	0.014 (-0.003, 0.031)	0.018 (0.001, 0.035)	0.239 (0.107, 1.260)
Model 5	0.005 (0.003, 0.007)	0.016 (-0.001, 0.033)	0.021 (0.004, 0.038)	0.235 (0.128, 0.998)

Abbreviations: CI = confidence interval; ACME = average causal mediation effect; ADE = average direct effect
Model 1: unadjusted. Model 2: adjusted for age, sex, race/ethnicity, marital status, and number of people in social network. Model 3: model 2 + education and homeownership. Model 4: model 3 + vision impairment, hearing impairment, mobility impairment, cognitive impairment, self-care impairment, and communication impairment. Model 5: model 4 + metropolitan status, residential duration, neighborhood physical disorder, and social cohesion

ISSN: 1471-2318