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Table 2 Agreement between travel diary and objective estimates of time spent using active and motorised modes and total time spent travelling

From: Development of methods to objectively identify time spent using active and motorised modes of travel to work: how do self-reported measures compare?

  N (trips) Median distance in km (IQR) Median duration in minutes (IQR) Lin's concordance coefficient (r) Mean difference (mean ± SD) 95% limits of agreement p-value for difference
Time spent in active travel for trip/stage*  
All active trips 136 12.8 (7.1, 25.8) 38.0 (23.8, 54.3) 0.95 1.13 (4.49) -7.67 to 9.95 0.001
  Only walking or cycling 50 4.2 (2.2, 12.1) 17.4 (13.1, 39.1) 0.95 2.39 4.68) -6.78 to 11.55 0.247
  Walking or cycling combined with other modes 86 22.7 (12.4, 30.5) 42.4 (35.0, 61.2) 0.91 0.40 (4.23) -7.9 to 8.69 0.001
  Direct trips 121 12.1 (5.4, 24.5) 36.5 (20.0, 46.3) 0.95 1.22 (4.42) -7.45 to 9.88 0.003
  Indirect trips 15 20.8 (19.6, 41.5) 61.2 (54.4, 124.3) 0.93 0.43 (5.11) -9.58 to 10.45 0.139
Time spent in motorised travel for trip/stage*  
All motorised trips 139 23.7 (13.2, 29.6) 40.1.0 (33.3, 58.7) 0.62 10.48 (12.30) -13.62 to 34.58 <0.001
  Car trips only 40 26.3 (20.5, 29.4) 35.0 (24.8, 45.5) 0.87 0.56 (6.04) -11.27 to 12.40 <0.001
  Car or bus trips when used in combination with other modes 99 20.8 (11.5, 32.0) 45.0 (35.7, 65.8) 0.59 14.49 (11.91) -8.86 to 37.84 0.016
  Direct trips 117 24.3 (12.5, 29.6) 38.8 (31.6, 52.8) 0.57 12.10 (12.51) -12.41 to 36.61 0.002
  Indirect trips 22 20.5 (19.6, 32.0) 60.7 (52.3, 91.0) 0.85 1.87 (6.09) -10.07 to 13.82 <0.001
Total time spent travelling  
All trips 204 20.4 (8.1, 29.0) 38.3 (27.2, 54.5) 0.94 1.85 (8.75) -15.31 to 19.01 <0.001
  Single mode used 90 12.2 (4.2, 26.3) 27.8 (16.2, 42.6) 0.96 1.40 (6.05) -10.46 to 13.26 <0.001
  More than one mode used 114 23.2 (12.4, 30.5) 44.3 (36.2, 65.5) 0.90 2.21 (10.42) -18.21 to 22.62 <0.001
  Direct trips 175 19.3 (7.3, 29.0) 36.6 (24.4, 48.3) 0.89 1.74 (8.89) -15.68 to 19.17 <0.001
  Indirect trips 29 20.6 (19.6, 29.3) 64.0 (54.0, 90.9) 0.97 2.50 (7.99) -13.1 to 18.15 0.031
  1. *Where only one mode is used, this represents the time for the trip; where a combination of modes is used, this represents the time for the active or motorised stage(s) of the trip. Distances and durations given are derived from objective estimates. IQR: inter-quartile range.
  2. The total number of trips included in the analysis of total trip duration (204) is greater than the sum of the numbers of `motorised’ (139) and `only walking or cycling` trips (50) because trips in which either modal transitions or stopovers at destinations en route could not be confidently identified were included in the analysis of total trip duration but not in the analyses of time spent using active or motorised modes. For further details please see Methods: data processing.