Table 3.
Evaluation of potential influences on Lave(d) and L10(h) at study sites. Shows mean, standard deviation (SD), median, interquartile range (IQR) and sample site (N) for two groups. P-values for t tests based on 2-sided tests and unequal variances.
| Group 1 |
Group 2 |
P-values |
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Comparison | Type | Mean | SD | Median | IQR | N | Type | Mean | SD | Median | IQR | N | t test | MW test |
| Monitor location | ||||||||||||||
| Leq(d) | Street-facing | 65.6 | 5.3 | 65.6 | 7.1 | 11 | Backyard | 57.0 | 1.4 | 57.5 | 2.0 | 10 | 0.000 | 0.000 |
| L10(h) | Street-facing | 68.7 | 5.6 | 68.6 | 7.6 | 11 | Backyard | 59.5 | 1.6 | 59.2 | 3.0 | 10 | 0.000 | 0.000 |
| Neighborhood | ||||||||||||||
| Leq(d) | Residential | 61.2 | 5.9 | 59.1 | 8.5 | 17 | Mixed | 62.6 | 6.6 | 60.5 | 7.6 | 4 | 0.724 | 0.574 |
| L10(h) | Residential | 64.0 | 6.2 | 62.1 | 9.7 | 17 | Mixed | 65.6 | 7.1 | 63.9 | 8.5 | 4 | 0.694 | 0.698 |
| Screening | ||||||||||||||
| Leq(d) | Little | 62.9 | 5.4 | 62.3 | 9.7 | 12 | Medium-High | 59.5 | 6.2 | 57.5 | 3.8 | 9 | 0.207 | 0.095 |
| L10(h) | Little | 66.1 | 5.7 | 65.4 | 8.0 | 12 | Medium-High | 61.9 | 6.4 | 58.8 | 3.2 | 9 | 0.137 | 0.041 |
| Road 1 Type(adjacent road) | ||||||||||||||
| Leq(d) | Residential | 61.3 | 6.2 | 57.9 | 9.2 | 19 | Arterial, I-75 | 62.9 | 0.5 | 62.9 | 0.4 | 2 | 0.304 | 0.467 |
| L10(h) | Residential | 64.0 | 6.4 | 61.1 | 9.6 | 19 | Arterial, I-75 | 67.8 | 1.1 | 67.8 | 0.8 | 2 | 0.043 | 0.400 |
| Road 2 Type (next nearest larger road) | ||||||||||||||
| Leq(d) | Residential | 70.9 | 3.1 | 71.7 | 3.1 | 3 | Arterial, I-75 | 59.9 | 4.6 | 57.8 | 5.2 | 18 | 0.008 | 0.006 |
| L10(h) | Residential | 74.4 | 2.7 | 75.1 | 2.7 | 3 | Arterial, I-75 | 62.6 | 4.9 | 61.1 | 7.3 | 18 | 0.003 | 0.003 |
| Nearby Truck Route within 30 m | ||||||||||||||
| Leq(d) | Beyond | 60.4 | 5.8 | 57.7 | 5.0 | 17 | Within | 66.1 | 4.0 | 65.5 | 5.6 | 4 | 0.055 | 0.052 |
| L10(h) | Beyond | 63.0 | 6.1 | 61.1 | 4.9 | 17 | Within | 69.9 | 3.3 | 68.9 | 2.4 | 4 | 0.014 | 0.052 |
| Nearby Truck Route within 50 m | ||||||||||||||
| Leq(d) | Beyond | 60.5 | 6.1 | 57.7 | 5.8 | 15 | Within | 64.0 | 4.9 | 62.9 | 4.4 | 6 | 0.194 | 0.178 |
| L10(h) | Beyond | 63.2 | 6.4 | 61.1 | 6.3 | 15 | Within | 67.0 | 5.3 | 67.8 | 4.5 | 6 | 0.197 | 0.178 |
| Nearby Truck Route within 100 m | ||||||||||||||
| Leq(d) | Beyond | 60.7 | 6.4 | 57.8 | 4.6 | 12 | Within | 62.4 | 5.3 | 62.5 | 8.0 | 9 | 0.519 | 0.508 |
| L10(h) | Beyond | 63.4 | 6.9 | 61.0 | 5.6 | 12 | Within | 65.5 | 5.4 | 67.0 | 6.4 | 9 | 0.436 | 0.345 |
| I-75 Grade | ||||||||||||||
| Leq(d) | Surface or Below | 61.9 | 6.4 | 59.1 | 10.3 | 13 | Elevated | 60.7 | 5.2 | 58.9 | 5.0 | 8 | 0.642 | 0.916 |
| L10(h) | Surface or Below | 64.6 | 6.6 | 62.1 | 10.2 | 13 | Elevated | 63.8 | 6.0 | 61.6 | 7.2 | 8 | 0.786 | 0.860 |
| I-75 Grade for sites within 100–325 m of I-75 | ||||||||||||||
| Leq(d) | Surface or Below | 59.3 | 4.4 | 57.5 | 5.7 | 5 | Elevated | 65.8 | 5.1 | 63.2 | 4.6 | 3 | 0.146 | 0.143 |
| L10(h) | Surface or Below | 61.6 | 4.1 | 59.6 | 4.7 | 5 | Elevated | 70.22 | 4.3 | 68.6 | 4.1 | 3 | 0.048 | 0.071 |