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Non-freeway NOx tracks children's BMI growth
In 4,550 Southern California children, non-freeway NOx associated with BMI at age 10 and 4-year growth; freeway NOx and near-road traffic density were weaker after confounding control.
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Which traffic pollutant associated with BMI level and growth?
Non-freeway NOx; freeway-related NOx was not associated with BMI growth.
Source: Traffic-related air pollution and obesity formation in children: a longitudinal, multilevel analysis · DOI · quote verified
How large was the cohort?
4,550 children across 13 Southern California communities.
Source: Traffic-related air pollution and obesity formation in children: a longitudinal, multilevel analysis · DOI · quote verified
What was mean age and BMI at entry?
6.6 years (SD 0.65); BMI 16.79 (SD 2.81).
Source: Traffic-related air pollution and obesity formation in children: a longitudinal, multilevel analysis · DOI · quote verified
How much did BMI rise by year 5?
About 2.6 units to 19.35.
Source: Traffic-related air pollution and obesity formation in children: a longitudinal, multilevel analysis · DOI · quote verified
Did 150 m traffic density survive full confounding control?
The slope effect stayed positive but fell >20% and was no longer borderline significant.
Source: Traffic-related air pollution and obesity formation in children: a longitudinal, multilevel analysis · DOI · quote verified
What notable confounder of traffic effects emerged?
Spanish-language questionnaire, marking recent Latin American immigrant families.
Source: Traffic-related air pollution and obesity formation in children: a longitudinal, multilevel analysis · DOI · quote verified
What neighborhood covariates were in the final traffic model?
Asthma, language, second-hand smoke, parental education, gamma index, fast food within 500 m, NDVI, recreation programs, plus 150 m traffic.
Source: Traffic-related air pollution and obesity formation in children: a longitudinal, multilevel analysis · DOI · quote verified
What obesity/overweight rates were observed?
14.4% overweight (85th–95th) and 15% obese (≥95th).
Source: Traffic-related air pollution and obesity formation in children: a longitudinal, multilevel analysis · DOI · quote verified
What policy implication do authors draw?
Cutting traffic pollution (emissions, land use, zero-emission vehicles, truck routing) may also reduce obesity formation.
Source: Traffic-related air pollution and obesity formation in children: a longitudinal, multilevel analysis · DOI · quote verified
Did physical-activity variables confound the association?
Several activity/sports measures were tested; none met inclusion as confounders.
Source: Traffic-related air pollution and obesity formation in children: a longitudinal, multilevel analysis · DOI · quote verified