0 = incomplete
1 = complete

Have you ever owned a fitness tracker to track your activity or diet (e.g., Fitbit, Polar, Apple Watch)?
0 = No
1 = Yes
999 = missing

Current use of any app
0 = No
1 = Yes
888 = not applicable
999 = missing

Current use of any tracking device
0 = No
1 = Yes

What is your gender?
0 = female
1 = male
888 = not applicable
999 = missing

888 = not applicable
999 = missing

1 = underfat
2 = Standard Minus
3 = Standard Plus
4 = Overfat
5 = Obese

1 = underfat
2 = Standard
3 = Over

1 = Football
2 = Futsal
3 = Volleyball
4 = Handball
5 = Basket
6 = Rugby
7 = Waterpolo
8 = Ultimate frisbee
9 = Badminton
10 = Track and field
11 = Table tennis
12 = Tennis
13 = Archery
14 = Swimming
888 = Double team
999 = Triple team

Sport category
1 = Individual sport
2 = Group sport
3 = Individual and group
888 = Not applicable
999 = Missing

Sport category
1 = Individual sport
2 = Group sport
888 = Not applicable
999 = Missing

1 = under_normal
2 = over_obese

1 = under_normal
2 = overweight/obese

BMI category
1 = Underweight
2 = Normal
3 = Overweight
4 = Obese
888 = Not applicable
999 = Missing

1 = Android
2 = iOS
3 = Both iOS and Android
888 = not applicable
999 = missing

1 = FitBit
2 = AppleWatch
3 = Both Applewatch and Fitbit
4 = Garmin
5 = Other

1 = MyFitnessPal
2 = AppleHealthKit
3 = Samsung health
4 = Runtastic
5 = Other

0 = Not Selected
1 = Selected