Initial conditions and functioning over time among community coalitions.

Developing operationally strong community coalitions is critical to actualizing their potential for public health improvement. The purpose of this study was to measure how substance use prevention coalitions in Mexico functioned across their first 1.5 years, and to test associations between initial community contextual factors and subsequent coalition functioning and outcomes. Members of 19 coalitions participated in three waves of surveys about coalition context and functioning. We used paired t-tests to assess changes in coalition functioning and outcomes. Regression models estimated associations between coalition functioning and outcomes and initial community context. Among coalition functioning factors, over coalitions' first 1.5 years, member engagement increased, as did coordinator skill and participatory leadership style. Two initial community context factors - community support for prevention and community champions - predicted several measures of process competence, but only community champions predicted perceived community improvement. Thus, community champions may play a pivotal role in later coalition success. The observed increases in member engagement and process competence may support subsequent coalition sustainability, a crucial component to realizing their potential impact on public health.