Table 1.

Baseline Characteristics and Prior Year Residential Traffic-Related Air Pollutant (TRAP) Concentrations in Adolescents from the Meta-AIR Study

	Mean ± SD
General Characteristics	n=43
Age (years)	18.8 ± 0.5
Sex (Males/Females, %)	25/18, 58%
Ethnicity (Hispanic/Non-Hispanic, %)	28/15, 65%
Metabolic Indices
Fasting Glucose (mg/dL)*	90.5 ± 7.7
1-Hour Glucose (mg/dL)*	145.9 ± 28.6
2-Hour Glucose (mg/dL)*	119.3 ± 21.7
Fasting Insulin (μU/mL)*	6.0 ± 3.2
HOMA-IR*	1.4 ± 0.8
Adiposity
Body Mass Index (kg/m2)	30.5 ± 5.9
Normal Weight/Overweight and Obese, %	8/35, 18.6%
Total Fat Mass (kg)	29.2 ± 11.9
Total Lean Mass (kg)	53.6 ± 14.9
Body Fat Percent (%)	33.1 ± 9.3
Energy Intake and Macronutrients
Energy Intake (Kcal)†	1,987.6 ± 606.3
Carbohydrates (g)†	247.6 ± 72.8
Fat (g)†	79.4 ± 35.9
Protein (g)†	76.6 ± 27.6
Fiber (g)†	16.5 ± 7.2
Prior Year Average Exposure to TRAP**
Total TRAP (ppb)	8.4 ± 6.5
Freeway TRAP (ppb)	6.4 ± 6.1
Non-Freeway TRAP (ppb)	1.9 ± 1.4

Baseline characteristics and prior one-year average exposure to TRAP (i.e., total, freeway, and non-freeway) from the Meta-AIR study visit.

^**Average prior year TRAP exposure was based on residential addresses where nitrogen oxides (NOx; ppb) were used as a marker of traffic emissions. Data are reported as mean with standard deviation (SD). Sample size is indicated as

^*40 and

^†39.