Table 1.
Daily averages of GIS parameters at subjects’ homes
| GIS variables | Riverside panel (27 subjects) | Whittier panel (32 subjects) | ||||||
|---|---|---|---|---|---|---|---|---|
| N | Mean (standard deviation) | Median | Min/Max | N | Mean (standard deviation) | Median | Min/Max | |
| Population density (1/km2) | 266 | 1,712 (1,057) | 1,696 | 141/3,782 | 316 | 3,568 (1,528) | 2,952 | 978/6,575 |
| Minimal distance to highways (m) | 266 | 2,653 (1,933) | 2,175 | 460/6,938 | 316 | 1,371 (929) | 1,084 | 121/3,339 |
| Minimal distance to arterial roads (m) | 266 | 488 (537) | 310 | 6/2,593 | 316 | 336 (317) | 248 | 20/1,130 |
| Minimal distance to collector roads (m) | 266 | 492 (338) | 401 | 26/1,275 | 316 | 294 (324) | 144 | 4/1,238 |
| Total traffic count (distance weighted) | 266 | 404 (567) | 228 | 68/3,149 | 316 | 617 (479) | 545 | 125/2,207 |
| Heavy-duty vehicle traffic count (distance weighted) | 266 | 21 (18) | 12 | 5/75 | 316 | 23 (18) | 16 | 5/89 |
| Light-duty vehicle traffic count (distance weighted) | 266 | 384 (562) | 216 | 63/3,074 | 316 | 594 (464) | 521 | 116/2,147 |