Table 4.
Asthma and traffic at residential address
| The 1st survey (2004) | The 2nd survey (2005) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Residential Address | n | Asthma n (%) |
Asthma (OR)1 |
n | Asthma n (%) | Asthma (OR)1 |
Asthma symptoms n (%) |
Asthma symtoms (OR)1 |
|
| Self-report Heaviest road <50 m | 0-1 cars/min | - | - | - | 445 | 105 (23.6) | 1.0 | 71(16.0) | 1.0 |
| < 2 cars/min | - | - | - | 1512 | 339 (22.4) | 1.10 (0.81-1.5) | 216(14.4) | 0.95 (0.66-1.4) | |
| 2-5 cars/min | - | - | - | 410 | 113 (27.6) | 1.17 (0.80-1.7) | 81(19.9) | 1.2 (0.76-1.8) | |
| 6-10 cars/min | - | - | - | 203 | 56 (27.6) | 1.20 (0.74-2.0) | 34(17.0) | 0.79 (0.42-1.5) | |
| > 10 cars/min | - | - | - | 258 | 76 (29.5) | 1.5 (0.94-2.3) | 48(18.5) | 1.2 (0.72-2.1) | |
| GIS Heaviest road <50 m | no heavy road | 15584 | 1542 (9.9) | 1.0 | 2100 | 494 (23.5) | 1.0 | 316 (15.1) | 1.0 |
| < 2 cars/min | 3691 | 375 (10.2) | 1.0 (0.90-1.2) | 472 | 121 (25.6) | 1.2 (0.89-1.6) | 79 (16.8) | 1.1 (0.81-1.6) | |
| 2-5 cars/min | 1555 | 159 (10.2) | 0.95 (0.76-1.2) | 216 | 61 (28.2) | 1.2 (0.79-1.7) | 39 (18.1) | 1.1 (0.71-1.8) | |
| 6-10 cars/min | 307 | 35 (11.4) | 1.0 (0.65-1.6) | 34 | 10 (29.4) | 1.0 (0.33-3.2) | 7(20.6) | 1.4 (0.39-5.1) | |
| > 10 cars/min | 223 | 29 (13.0) | 1.8 (1.1-2.8) | 36 | 12 (33.3) | 2.3 (0.99-5.2) | 12 (33.3) | 4.6 (2.0-10.6) | |
| GIS Heaviest road <100 m | no heavy road | 10875 | 1062 (9.8) | 1.0 | 1461 | 330 (22.6) | 1.0 | 215 (14.7) | 1.0 |
| < 2 cars/min | 5741 | 589 (10.3) | 1.1 (0.92-1.2) | 744 | 197 (26.5) | 1.4 (1.1-1.7) | 128 (17.4) | 1.2 (0.92-1.7) | |
| 2-5 cars/min | 3309 | 327 (9.9) | 0.96 (0.81-1.1) | 462 | 121 (26.2) | 1.2 (0.88-1.6) | 75 (16.3) | 1.1 (0.80-1.7) | |
| 6-10 cars/min | 894 | 101 (11.3) | 1.2 (0.92-1.6) | 119 | 29 (24.4) | 1.4 (0.82-2.3) | 14 (11.8) | 0.81 (0.38-1.7) | |
| > 10 cars/min | 541 | 61 (11.3) | 1.3 (0.95-1.8) | 72 | 21 (29.2) | 1.6 (0.82-3.2) | 21 (29.2) | 2.7 (1.3-5.5) | |
| GIS Heaviest road <250 m | no heavy road | 4412 | 429 (9.7) | 1.0 | 590 | 136 (23.1) | 1.0 | 84 (14.2) | 1.0 |
| < 2 cars/min | 7079 | 698 (9.9) | 1.0 (0.86-1.2) | 904 | 225 (24.9) | 1.1 (0.85-1.5) | 147 (16.4) | 1.1 (0.7-1.5) | |
| 2-5 cars/min | 6297 | 636 (10.1) | 0.96 (0.82-1.1) | 870 | 220 (25.3) | 1.1 (0.83-1.5) | 139 (16.1) | 1.0 (0.7-1.4) | |
| 6-10 cars/min | 2100 | 222 (10.6) | 1.1 (0.86-1.3) | 298 | 68 (22.8) | 1.2 (0.77-1.7) | 42 (14.1) | 1.0 (0.6-1.9) | |
| > 10 cars/min | 1472 | 155 (10.5) | 0.98 (0.76-1.3) | 196 | 49 (25.0) | 0.8 (0.51-1.4) | 41 (20.7) | 1.1 (0.6-1.9) | |
| GIS NOx (μg/m3 ) (250 × 250 m) | 0-8 | 11273 | 1111 (9.9) | 1.0 | 1508 | 376 (24.9) | 1.0 | 240 (16.0) | 1.0 |
| 8-11 | 3133 | 300 (9.6) | 0.94 (0.79-1.1) | 371 | 78 (21.0) | 0.79 (0.56-1.1) | 45 (12.3) | 1.0 (0.74-1.49) | |
| 11-14 | 2496 | 256 (10.3) | 1.1 (0.93-1.3) | 388 | 90 (23.2) | 1.2 (0.86-1.6) | 57 (14.8) | 0.97 (0.68-1.39) | |
| 14-19 | 2319 | 229 (9.9) | 0.84 (0.69-1.0) | 298 | 77 (25.8) | 1.0 (0.73-1.5) | 55 (18.4) | 0.99 (0.60-1.6) | |
| > 19 | 2139 | 244 (11.4) | 1.1 (0.93-1.4) | 293 | 77 (26.3) | 1.1 (077) | 56 (19.1) | 1.1 (0.60-1.9) | |
1Adjusted for age, sex, BMI, socio-economy, smoking, and occupational exposure. [OR(95%CI)]