Table 2 Environmental characteristics of the study population by age group.
| Â | Age (years) | |||||
|---|---|---|---|---|---|---|
| Â | 0-17 | 18-34 | 35-64 | 65-74 | 75+ | Total |
N | 289,539 | 420,169 | 821,153 | 214,332 | 153,705 | 1,898,898 |
Distance from HTR mean (sd) % | 302 (506) | 286 (480) | 274 (457) | 241 (420) | 208 (340) | 272 (459) |
> = 250 | 37.4 | 35.6 | 34.4 | 30.2 | 25.9 | 34.0 |
[150-250) | 20.5 | 20.2 | 20.6 | 21.4 | 21.5 | 20.7 |
[100-150) | 14.0 | 14.3 | 14.6 | 15.4 | 16.2 | 14.6 |
[50-100) | 12.9 | 13.5 | 13.8 | 14.7 | 16.0 | 13.9 |
< = 50 | 15.3 | 16.4 | 16.6 | 18.3 | 20.4 | 16.9 |
Meters of HTR within 150 m from home | ||||||
mean (sd) for those who live at < = 150 m from HTR % | 268 (159) | 271 (161) | 272 (161) | 276 (163) | 282 (166) | 272 (161) |
living at > = 150 m from HTR | 57.9 | 55.8 | 55.1 | 51.6 | 47.4 | 54.6 |
1st quartile (<166 m) | 10.8 | 11.2 | 11.3 | 11.7 | 12.2 | 11.3 |
2nd quartile (166-266 m) | 10.7 | 11.1 | 11.3 | 11.9 | 12.9 | 11.3 |
3rd quartile (266-323 m) | 10.6 | 11.0 | 11.2 | 12.3 | 13.1 | 11.3 |
4th quartile (323-1445 m) | 10.0 | 11.0 | 11.1 | 12.5 | 14.4 | 11.3 |
Daily average traffic count on the closest HTR within 150 m | ||||||
mean (sd) for those who live at < = 150 m from HTR % | 21686 (14272) | 21832 (14255) | 21774 (14006) | 21975 (13497) | 21920 (12776) | 21533 (15094) |
living at > = 150 m from HTR | 57.9 | 55.8 | 55.1 | 51.6 | 47.4 | 54.6 |
(10000-15000) | 17.9 | 18.4 | 18.7 | 19.3 | 20.7 | 18.8 |
[15000-20000) | 7.9 | 8.5 | 8.5 | 9.0 | 9.6 | 8.6 |
[20000-30000) | 7.9 | 8.3 | 8.5 | 9.6 | 10.7 | 8.7 |
> = 30000 | 8.4 | 9.0 | 9.2 | 10.4 | 11.6 | 9.4 |
Traffic density from HTR within 150 m (vehicle meters of HTR/m 2 ) | ||||||
mean (sd) for those who live at < = 150 m from HTR % | 105 (91) | 107 (91) | 106 (88) | 109 (85) | 111 (81) | 107 (88) |
living at > = 150 m from HTR | 57.9 | 55.8 | 55.1 | 51.6 | 47.4 | 54.6 |
1st quartile (< = 51) | 11.4 | 11.3 | 11.4 | 11.2 | 11.4 | 11.3 |
2nd quartile (52-82) | 10.5 | 11.1 | 11.3 | 12.1 | 12.8 | 11.3 |
3rd quartile (83-137) | 10.3 | 10.9 | 11.2 | 12.4 | 13.9 | 11.3 |
4th quartile (137-1257) | 9.9 | 10.9 | 11.1 | 12.7 | 14.5 | 11.3 |