235961 Association of neighborhood economic status with adults' physical inactivity in Los Angeles County

Sunday, October 30, 2011

Donglan Zhang , Department of Health Services, UCLA School of Public Health, Los Angeles, CA
Kara E. MacLeod, MPH, MA , School of Public Health, University of California, Los Angeles, CA
Gigi Mathew, DrPH, CPHQ , Health Assessment and Epidemiology, Los Angeles County Department of Public Health, Los Angeles, CA
Lu Shi, PhD , Department of Health Services, University of California Los Angeles, Los Angeles, CA
Background: Physical inactivity is a major risk factor for obesity and diabetes. We hypothesized that adjusting for other predictors including individual-level income, neighborhood economic status (NES), measured as median income per capita within the neighborhood is independently associated with physical inactivity in adults.

Methods: We used three cross-sectional Los Angeles County Health Survey samples of adults (ages 18+): 2002 (n=8050), 2005 (n=8484) and 2007 (n=7140), linked with 2000 census data by zip code. We dichotomized the self-reported physical inactivity measure: 1= minimal and no activity in a usual week and 0= some vigorous or moderate activity. NES was categorized into three strata; low (<$20,683), median ($20,683-$41,366) and high (>$41,366). To achieve adequate statistical power, we applied ArcGIS to merge small zipcode areas into large regions. Multi-level logistic regression was used in each cross-sectional dataset.

Results The odds ratios with median NES level for the three datasets (2002, 2005 and 2007 respectively) after adjusting for individual and neighborhood-level variables were the following: 0.92 (95% confidence interval 0.77 to 1.09), 0.95 (0.81 to 1.12) and 0.90 (0.75 to 1.09). The odds ratios with high NES level were 0.79 (0.60 to 1.04), 0.81 (0.63 to 1.04) and 0.76 (0.57 to 1.01). The P-values with continuous NES measure were statistically significant (P<0.01) except for the 2007 dataset (P=0.086).

Conclusions We found a moderately negative association of neighborhood economic status with individuals' physical inactivity in LA County. Interventions promoting physical activity should target low-income neighborhoods.

Learning Areas:
Public health administration or related administration
Public health or related public policy
Social and behavioral sciences

Learning Objectives:
Assess the association of neighborhood economic status on adults' (ages 18+) physical activity behavior in Los Angeles County.

Keywords: Community Development, Physical Activity

Presenting author's disclosure statement:

Qualified on the content I am responsible for because: I am qualified to present because I do part of data analysis
Any relevant financial relationships? No

I agree to comply with the American Public Health Association Conflict of Interest and Commercial Support Guidelines, and to disclose to the participants any off-label or experimental uses of a commercial product or service discussed in my presentation.