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