Traffic-related air pollution exposure variables for the 709 participants who had a geocoded residential address at age 45 and 50 years
| Age 45 years | Age 50 years | |
| Residential address <200 m from a major road | 198 (28.0) | 196 (27.64) |
| Mean annual nitrogen dioxide exposure ppb | ||
| Quartile 1 | 3.7 | 3.1 |
| Quartile 2 | 4.6 | 3.9 |
| Quartile 1 | 6.1 | 5.4 |
| Mean±sd | 5.4±2.8 | 4.6±2.6 |
| Lowest | 2.5 | 1.8 |
| Highest | 23.8 | 22.9 |
Data are presented as n (%), unless otherwise stated.