Continuous predictor variables for the measurement sites (n = 40) and the birth cohort (n = 3577)
| Variable | Measurement sites | Birth cohort | ||
|---|---|---|---|---|
| Mean (m) | Range (m) | Mean (m) | Range (m) | |
| Distance to nearest federal road | 1896.42 | 314.81–3376.76 | 1575.92 | 14.29–12138.89 |
| Distance to closest motorway | 128.10 | 0–275.60 | 2046.59 | 56.46–24893.45 |
| Length of rural roads (100–250 m) | 2045.23 | 441.24–3927.06 | 2031.24 | 1537.27–4036.83 |
| Length of rural roads (250–500 m) | 6792.21 | 3765.17–10926.62 | 6313.34 | 4680.79–11748.14 |
| Length of rural roads (2500–5000 m) | 551997.18 | 733786.91–2055943.42 | 531476.13 | 693386.93–1945395.42 |
| Length of county roads (0–1000 m) | 0 | 0–653.14 | 0 | 0–4498.83 |
| Length of motorway (2500–5000 m) | 56.98 | 14.65–141.36 | 271.21 | 0–2658.97 |
| Length of state roads (1000–2500 m) | 2430.17 | 0–11861.50 | 5872.78 | 0–11748.14 |
| Household density (2500–5000 m) | 72633 | 19481–125443 | 31644 | 435–132100 |
| Population density (500–1000 m) | 4486 | 1790–18091 | 2496 | 96–17044 |