Table 1.
Baseline Characteristics and Prior Year Ambient and Near-Roadway Concentration in Young Adults from the Meta-AIR Study
| Mean ± SD | Missing Values | |
|---|---|---|
| General Characteristics | n=101 | |
| Age (years) | 19.6 ± 0.9 | 0 |
| Sex (Males/Females, %) | 58/43, 57.4% | 0 |
| Ethnicity (Hispanic/Non-Hispanic, %) | 55/46, 54.5% | 0 |
| BMI (kg/m2) | 28.9 ± 5.4 | 0 |
| Parental Education | ||
| Low (n, %) | 43, 42.6% | 0 |
| High (n, %) | 38, 37.6% | 0 |
| Unknown/Missing (n, %) | 20, 19.8% | - |
| Metabolic Indices | ||
| Fasting Glucose (mg/dL) | 89.8 ± 8.7 | 4 |
| Fasting Insulin (μU/mL) | 10.6 ± 7.6 | 25 |
| Body Fat Percent (%) | 34.6 ± 8.8 | 17 |
| 2-Hour Glucose (mg/dL) | 120.2 ± 28.6 | 19 |
| 2-Hour Insulin (μU/mL) | 102.2 ± 100.6 | 19 |
| Glucose Area Under the Curve | 272.8 ± 46.5 | 19 |
| Insulin Area Under the Curve | 243.8 ± 167.2 | 38 |
| HOMA-IR | 2.4 ± 1.8 | 25 |
| HOMA-B | 163.4 ± 152.4 | 25 |
| Energy Intake and Macronutrients | ||
| Energy Intake (Kcal) | 1994.0 ± 655.9 | 20 |
| Carbohydrates (g) | 241.4 ± 79.1 | 20 |
| Fat (g) | 80.4 ± 34.8 | 20 |
| Protein (g) | 81.6 ± 34.6 | 20 |
| Fiber (g) | 17.6 ± 6.7 | 20 |
| Prior Year Average Exposure to Air Pollutants** | ||
| NO2 (ppb) | 15.5 ± 3.9 | 1 |
| PM10 (μg/m3) | 30.1± 7.1 | 0 |
| PM2.5 (μg/m3) | 12.0 ± 2.5 | 0 |
| O3 (ppb) | 29.8 ± 2.5 | 0 |
| Total NOx (ppb) | 7.1± 7.1 | 1 |
**
Average prior year exposure to ambient and near-roadway air pollutants based on residential addresses. Nitrogen oxides (NOx) in parts per billion (ppb) were used as a marker of traffic emissions. Data are reported as mean with standard deviation (SD). Parental education was defined as low (n=43), high (n=38), or unknown/missing (n=20). Low was defined as <12th grade, completed grade 12, and some college or technical school. High was defined as 4 years of college and some graduate training college.