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Table 3 Summary of the questionnaire and the GPS data a on travel distance and duration averaged by each subject sampling week for workers who commuted by automobiles and had GPS work-related trips (N = 51 person-weeks or 124 person-days)

From: Travel patterns during pregnancy: comparison between Global Positioning System (GPS) tracking and questionnaire data

  Home to work commute Work to home commute
  Self-reported trip distance (km) GPS-based trip distance (km) Self-reported trip duration (minute) GPS-based trip duration (minute) Self-reported trip distance (km) GPS-based trip distance (km) Self-reported trip duration (minute) GPS-based trip duration (minute)
Number of person-weeks 44 45 45 45 41 44 44 44
Trip-level statistics         
Minimum 1.6 1.7 4.0 3.5 1.6 1.8 5.0 3.6
Maximum 64.4 59.6 60.0 99.9 88.5 62.9 90.0 106.6
Mean 18.3 17.3 20.8 19.9 21.2 18.7 27.0 22.8
Standard deviation 16.7 15.1 13.8 18.1 22.4 15.7 21.8 17.9
Daily meanb 12.9 NA 16.5 NA 14.0 NA 17.8 NA
  Pearson’s correlation coefficient
Self-reported trip distance 1.00     1.00    
GPS-based trip distance 0.88 1.00    0.80 1.00   
Self-reported trip duration 0.85 0.85 1.00   0.93 0.77 1.00  
GPS-based trip duration 0.78 0.84 0.77 1.00 0.68 0.87 0.64 1.00
  1. aBased on data from valid GPS days (≥50% of GPS data between 7:00 AM and 10:59 PM).
  2. bWeighted average of the trip mean by the number of working and non-working days for subjects (mean = 4.3 days; range: 1–7 days).