Table 1 Characteristics of the study population over time
| Â | Â | 1994 (n = 956) | 2000 (n = 1535) | 2005 (n = 1753) | Test for linear trend p-valuewt |
|---|---|---|---|---|---|
Characteristic | Â | %wt | %wt | %wt | Â |
Sociodemographic | Â | Â | Â | Â | Â |
Sex: | boys | 53.5 | 52.8 | 52.8 | 0.8081 |
Age: | meanwt ± sewt | 10.2 ± 0.10 | 10.1 ± 0.08 | 10.2 ± 0.08 | 0.6582 |
Nationality: | Swiss | 81.2 | 81.6 | 78.9 | 0.2590 |
Area type: | urban | 63.8 | 59.4 | 57.0 | 0.0042 |
Regional language: | German | 75.6 | 72.3 | 70.0 | 0.0058 |
| Â | French | 21.4 | 23.4 | 24.8 | Â |
| Â | Italian | 3.0 | 4.3 | 5.2 | Â |
Environmental | Â | Â | Â | Â | Â |
Distance to school: | in Km meanwt ± sewt | 2.2 ± 0.19 | 2.5 ± 0.25 | 2.4 ± 0.14 | 0.5721 |
|  | within ≤ 1 Km | 60.7 | 59.7 | 55.2 | 0.0155 |
|  | within ≤ 1 mile†| 70.9 | 69.1 | 67.6 | 0.1342 |
Number of cars at home: | none | 9.0 | 6.2 | 5.8 | < 0.0001 |
| Â | 1 | 64.5 | 52.6 | 52.5 | Â |
| Â | 2 | 22.9 | 35.9 | 37.1 | Â |
|  | ≥ 3 | 3.0 | 5.3 | 4.6 |  |
Bicycle availability: | always | 91.1 | 86.2 | 85.1 | 0.0008 |
| Â | need to ask | 3.4 | 3.8 | 9.1 | Â |
| Â | Never | 5.5 | 10.0 | 5.8 | Â |