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Table 1 Characteristics of the study population over time

From: Trend in active transportation to school among Swiss school children and its associated factors: three cross-sectional surveys 1994, 2000 and 2005

   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. 1 mile = 1.609 Km
  2. wt = sample weighted