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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.