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. Author manuscript; available in PMC: 2015 Sep 27.
Published in final edited form as: Pediatr Pulmonol. 2014 Mar 27;50(3):252–259. doi: 10.1002/ppul.23029

Table 2.

Distributions of Distance to Roadway and Traffic Density at Study Enrollment Data from 1,263 mother-infant pairs participating in Project Viva.

Exposure Median IQR* Range
Distance to Major Roadway (m) 1,090 1,956 9.6 - 12,941
Traffic Density (vehicle-km/day) 895 1,485 0.4 - 16,916
*

IQR = interquartile range