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Table 4 Overview of source data from three studies and harmonisation process for derivation of ICAD_SchoolTravel2

From: Harmonising data on the correlates of physical activity and sedentary behaviour in young people: Methods and lessons learnt from the international Children’s Accelerometry database (ICAD)

Source data Harmonisation
Study
Wave
Variable(s): name(s), description Summary Category Processing Summary
SPEEDY
Wave: 1
Variable name:
W1_school_travel
Mode of travel to school
Car, n = 923
Bus/train, n = 127
Bicycle, n = 189
On foot, n = 814
Missing, n = 11
Active mode If [W1_school_travel] = Bicycle OR On foot n = 1003
Other mode If [W1_school_travel] = Car OR Bus/train n = 1050
Missing If [W1_school_travel] = Missing n = 11
KISS
Wave: 1
Variable name:
a_schulweg_hin_sommer
Mode of travel to school during summer
Walk, n = 392
Cycle/scooter, n = 51
Car, n = 7
Bus/train/tram, n = 3
Missing, n = 87
Active mode If [a_schulweg_hin_sommer] = Walk OR Cycle/scooter n = 443
Other mode If [a_schulweg_hin_sommer] = Car OR Bus/train/tram n = 10
Missing If [a_schulweg_hin_sommer] = Missing n = 87
Ballabeina
Wave: 1
Variable name:
W1_a_schulweg
Mode of travel to school
Walk, n = 546
Cycle/scooter, n = 1
Bus/tram, n = 4
Car, n = 32
Other, n = 24
Missing, n = 62
Active mode If [W1_a_schulweg] = Walk OR Cycle/scooter n = 547
Other mode If [W1_a_schulweg] = Bus OR Car OR Other n = 60
Missing If [W1_a_schulweg] = Missing n = 62
  1. For brevity, processing is summarised for data collected at study wave 1 only. Similar procedures were used for subsequent waves