Odds ratios for persistence of wheeze into adolescence in relation to traffic activity near the child's current school
| TAI (in millions) | Children (n) | With wheeze (n (%)) | OR4-150 (95% CI) n=765 |
| Continuous TAI | p = 0.06 | ||
| Per 10 unit increase | 765 | 351 (45.9) | 1.05 (1.00 to 1.11) |
| Tertiles | p = 0.37 | ||
| Low ⩽22 | 307 | 137 (44.6) | 1 |
| Medium 23–31 | 261 | 116 (44.4) | 0.99 (0.71 to 1.38) |
| High ⩾32 | 197 | 98 (49.7) | 1.26 (0.88 to 1.81) |
↵4-150 Adjusted for age and sex only.