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Method: Using data from 1,188 older adults in Detroit, MI, who qualify for federally funded home care, a latent class growth analysis was used to model the frequency of going outside over a 15-month period. Results: Four latent trajectories were found: those with a low, high, and declining frequency of going outdoors over time, and those who do not go outdoors on a regular basis. Risk factors for membership in the homebound and infrequent mobility groups were older age, more severe mobility impairment, and fear of falling. Barriers at the entry to the home were associated with being homebound. Discussion: Declining health status and functional limitations are risk factors that pose a threat to outdoor mobility in the frail elderly, while housing barriers and community accessibility also merit attention.<\/jats:p>","DOI":"10.1177\/0898264315611665","type":"journal-article","created":{"date-parts":[[2015,10,20]],"date-time":"2015-10-20T21:43:05Z","timestamp":1445377385000},"page":"796-811","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":28,"title":["Trajectories of Outdoor Mobility in Vulnerable Community-Dwelling Elderly"],"prefix":"10.1177","volume":"28","author":[{"given":"Abigail R.","family":"Smith","sequence":"first","affiliation":[{"name":"University of Michigan, Ann Arbor, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Charity","family":"Chen","sequence":"additional","affiliation":[{"name":"University of Michigan, Ann Arbor, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Philippa","family":"Clarke","sequence":"additional","affiliation":[{"name":"University of Michigan, Ann Arbor, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nancy Ambrose","family":"Gallagher","sequence":"additional","affiliation":[{"name":"University of Michigan, Ann Arbor, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2015,10,20]]},"reference":[{"key":"bibr1-0898264315611665","first-page":"1","volume-title":"Gait disorders: Evaluation and management","author":"Alexander N. 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