|  | N (%) | Arithmetic mean(STD a ) | Geometric mean (STD a ) | P-value b | Range |
---|---|---|---|---|---|---|
Overall | Â | 28 (100.0%) | 11.0(6.2) | 9.3(1.9) | Â | 1.7-29.9 |
Complete days of measurements (≥6 h/day) | 1 day | 6 (21.4%) | 8.1(6.5) | 5.7(2.7) | 0.17 | 1.7-15.4 |
2-5 days | 8 (28.6%) | 13.5(7.3) | 12.2(1.6) |  | 6.6-29.9 | |
6-9 days | 8 (28.6%) | 11.3(6.7) | 9.9(1.7) |  | 4.6-24.3 | |
≥10 days | 6 (21.4%) | 10.2(3.2) | 9.8(1.5) |  | 4.4-13.2 | |
Age | 18-29 | 15 (53.6%) | 10.5(6.9) | 8.4(2.1) | 0.40 | 1.7-29.9 |
30-38 | 13 (46.4%) | 11.5(5.6) | 10.4(1.7) | Â | 4.4-24.3 | |
Race/Ethnicity | Asian | 6 (21.4%) | 11.7(4.7) | 10.8(1.7) | 0.42 | 4.4-15.8 |
Hispanic | 13 (46.4%) | 10.6(7.3) | 8.4(2.2) | Â | 1.7-29.9 | |
Non-Hispanic White | 6 (21.4%) | 13.4(6.2) | 12.4(1.6) | Â | 6.6-24.3 | |
Other | 3 (10.7%) | 6.2(1.6) | 6.2(1.3) | Â | 4.6-7.7 | |
Income | Low (<$50 k/year) | 15 (53.6%) | 10.7(5.6) | 9.3 (1.9) | 1.00 | 1.7-24.3 |
High (≥$50 k/year) | 13 (46.4%) | 11.3(7.2) | 9.3 (2.0) |  | 2.4-29.9 | |
Speaking English at home | No | 11 (39.3%) | 12.5(4.9) | 11.9(1.4) | 0.11 | 6.6-24.3 |
Yes | 17 (60.7%) | 10.0(7.0) | 8.0(2.1) | Â | 1.7-29.9 | |
Worker | No | 11 (39.3%) | 9.2(5.0) | 7.6(2.1) | 0.19 | 1.7-15.8 |
Yes | 17 (60.7%) | 12.2(6.8) | 10.6(1.8) | Â | 2.8-29.9 | |
Had work-related exposure to traffic pollutantsc | No | 23(82.1%) | 10.1(6.0) | 8.5(1.9) | 0.10 | 1.7-29.9 |
Yes | 5(17.9%) | 15.2(6.1) | 14.3(1.5) | Â | 7.7-24.3 | |
Indoor time | <90.7% | 14 (50%) | 11.9(7.9) | 9.5(2.2) | 0.91 | 1.7-29.9 |
≥90.7% | 14 (50%) | 10.1(4.1) | 9.2(1.7) |  | 2.4-16.3 | |
In-vehicle time | <3.8% | 14 (50%) | 9.3(5.2) | 7.6(2.1) | 0.11 | 1.7-16.3 |
≥3.8% | 14 (50%) | 12.6(6.9) | 11.3(1.6) |  | 4.6-29.9 | |
Weekday | <72.9% | 14 (50%) | 9.9(7.5) | 7.6(2.2) | 0.09 | 1.7-29.9 |
≥72.9% | 14 (50%) | 12.1(4.7) | 11.4(1.4) |  | 6.6-24.3 | |
Daytime | <54.1% | 14 (50%) | 10.7(6.8) | 9.1(1.9) | 0.85 | 2.4-29.9 |
≥54.1% | 14 (50%) | 11.3(5.9) | 9.6(2.0) |  | 1.7-24.3 | |
Time in rush hour | <21.6% | 14 (50%) | 10.8(4.1) | 10.1(1.5) | 0.54 | 4.4-16.3 |
≥21.6% | 14 (50%) | 11.2(8.0) | 8.6(1.3) |  | 1.7-29.9 | |
GPS speed | <1.9 km/h | 14 (50%) | 9.1(4.9) | 7.6(2.1) | 0.10 | 1.7-16.3 |
≥1.9 km/h | 14 (50%) | 12.8(7.1) | 11.4(1.7) |  | 4.6-29.9 | |
Elevation | <26.6 m | 14 (50%) | 12.0(5.3) | 10.6(1.9) | 0.30 | 1.7-24.3 |
≥26.6 m | 14 (50%) | 10.0(7.1) | 8.2(2.0) |  | 2.4-29.9 | |
Length-weighted AADT within 500 m | <23172 vehicles/day | 14 (50%) | 10.2(7.1) | 8.1(2.1) | 0.28 | 1.7-29.9 |
≥23172 vehicles/day | 14 (50%) | 11.8(5.4) | 10.6(1.7) |  | 2.8-24.3 | |
Traffic density within 300 m | <79891 vehicles per day*km/km2 | 14 (50%) | 8.4(4.6) | 7.0(2.0) | 0.02 | 1.7-15.4 |
≥79891 vehicles per day*km/km2 | 14 (50%) | 13.5(6.7) | 12.3(1.6) |  | 6.3-29.9 | |
Ambient temperature | <20.6 °C | 14 (50%) | 9.9(5.9) | 8.3(1.9) | 0.37 | 2.4-24.3 |
≥20.6 °C | 14 (50%) | 12.1(6.6) | 10.4(1.9) |  | 1.7-29.9 | |
Ambient relative humidity | <63.7% | 14 (50%) | 13.9(7.0) | 12.2(1.8) | 0.02 | 2.8-29.9 |
≥63.7% | 14 (50%) | 8.1(3.9) | 7.1(1.9) |  | 1.7-13.2 | |
Wind speed | <4.3 m/s | 14 (50%) | 11.2(6.6) | 9.7(1.8) | 0.75 | 2.4-29.9 |
 | ≥4.3 m/s | 14 (50%) | 10.8(6.2) | 8.9(2.1) |  | 1.7-24.3 |