Table 1.
Characteristics of the study population over time
| 1994 (n = 956) |
2000 (n = 1535) |
2005 (n = 1753) |
Test for linear trend p-valuewt |
||
|---|---|---|---|---|---|
| Characteristic | %wt | %wt | %wt | ||
| Sociodemographic | |||||
| 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 |
| French | 21.4 | 23.4 | 24.8 | ||
| Italian | 3.0 | 4.3 | 5.2 | ||
| Environmental | |||||
| 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 |
| 1 | 64.5 | 52.6 | 52.5 | ||
| 2 | 22.9 | 35.9 | 37.1 | ||
| ≥ 3 | 3.0 | 5.3 | 4.6 | ||
| Bicycle availability: | always | 91.1 | 86.2 | 85.1 | 0.0008 |
| need to ask | 3.4 | 3.8 | 9.1 | ||
| Never | 5.5 | 10.0 | 5.8 | ||
† 1 mile = 1.609 Km
wt = sample weighted