Table 2 Summary of the 67 features by task and feature category

TUG

Temporal

1

Duration

Sit-to-stand (SiSt)

Linear acceleration features (in the order of V, ML, AP)

2–4

Maximum

5–7

Minimum

8–10

Range

11–13

RMS

14–16

Maximum jerk

17–19

Mean jerk

20–22

Δjerk

Temporal

23

Duration

Walking

Linear acceleration features (in the order of V, ML, AP)

24–26

RMS

Spatial features

27

Step Length

Temporal

28

Cadence

29

Gait speed

30

Step time

31

Stride time

32

CV of step time

33

CV of stride time

Frequency features (in the order of V, ML, AP)

34–36

Dominant FFT peak

37–39

1st FFT

40–42

REOH

Stand-to-sit (StSi)

Linear acceleration features (in the order of V, ML, AP)

43–45

Maximum

46–48

Minimum

49–51

Range

52–54

RMS

55–57

Maximum jerk

58–60

Mean jerk

61–63

Δjerk

Temporal

64

Duration

65

SD (SiSt, StSi)

Demographic features

Other

66

Age

67

Gender