Defining the "urban" in urbanization and health: a factor analysis approach

Urban environments have been linked to a range of human health issues, and as the pace of urbanization accelerates, new challenges arise to characteri ze these environments, and to understand their positive and negative implic ations for health. We seek to contribute to future studies of urbanization and health by exploring multiple definitions of urbanicity in the Philippin es, using data from an ongoing, longitudinal study. We use factor analysis to identify meaningful clusters of household- and community-level variables , and to generate factor scores that summarize each household's position wi th respect to access to infrastructure and health services, and level of af fluence. Factor scores are considered for 1983 and 1994 to assess the type and pace of change that has occurred in the Philippines, and scores are com pared across urban and rural areas, and across six different settlement typ es, to explore household- and community-level markers of urbanicity. This a nalysis demonstrates the heterogeneity of environments within urban and rur al areas, and emphasizes the need for a finer level of investigation in Fut ure studies of urbanization and health. (C) 2001 Elsevier Science Ltd. All rights reserved.