Importance: Asthma is often poorly controlled. Home visitation by community health workers (CHWs) to improve control among adults has not been adequately evaluated.

Objective: To test the hypothesis that CHW home visits for adults with uncontrolled asthma improve outcomes relative to usual care.

Design, Setting, and Participants: Randomized parallel group study with 1-year follow-up, conducted 2008 through 2011 at homes of low-income adults aged 18 to 65 years with uncontrolled asthma living in King County, Washington

Interventions: The CHWs provided a mean of 4.9 home visits during a 1-year period to assess asthma control, self-management, and home environment and to support asthma self-management practices.

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