Individuals divided into two age classes
1 = Younger than 50 years
2 = 50 years or older

Smoker or non-smoker
1 = Smoker
2 = Non-smoker

Diabetic or non-diabetic
1 = Diabetic
2 = Non-diabetic

The individuals side with an amputation
1 = Right
2 = Left

Type of amputation - transtibial or transfemoral
1 = transfemoral
2 = transtibial

Side and type of amputation
11 = right/transfemoral
12 = right/transtibial
21 = left/transfemoral
22 = left/transtibial

Person's mean velocity as measured using Prosthetic Activity Monitor
999 = Value not registered