Associations between Walkability and Youth Obesity: Differences by Urbanicity

Area of Science:

• Environmental Health
• Pediatric Obesity
• Urban Planning

Background:

• Built environment features like neighborhood walkability influence physical activity and obesity.
• Research on neighborhood walkability and youth obesity is limited and shows mixed results.
• Understanding these associations is crucial for public health interventions targeting childhood obesity.

Purpose of the Study:

• To examine the association between neighborhood walkability and youth obesity (BMI z-score).
• To investigate how urbanicity moderates the relationship between walkability and youth obesity.
• To explore differences in this association across urban, urban-rural mixed, and rural settings.

Main Methods:

• Objective measurement of height and weight to calculate BMI z-scores for 13,469 youth (aged 7-14).
• Utilized Walk Score® based on home addresses to quantify neighborhood walkability.
• Employed multilevel linear regression analysis, accounting for geographic clustering and testing for urbanicity's moderating effect.

Main Results:

• A higher Walk Score was associated with a decreased youth BMI z-score overall.
• The association differed by urbanicity: positive in urban areas, negative in rural areas.
• No significant relationship was found between Walk Score and BMI z-score in urban-rural mixed areas.

Conclusions:

• Neighborhood walkability's impact on youth obesity is context-dependent and varies by geographic setting.
• Further research is needed to understand youth's use of walkable environments and the underlying mechanisms.
• Findings suggest tailored strategies may be necessary to leverage walkability for reducing youth obesity across different environments.