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Table 7 Confusion matrices after the classification of the activity levels along with the corresponding evaluation metrics

From: Improving activity recognition using a wearable barometric pressure sensor in mobility-impaired stroke patients

  

Classification

  
  

Flat

Elevator down

Elevator up

Stairs down

Stairs up

F-score

CCR

  

H-FIS

Reference

Flat

23093.8

39.3

31

111.7

70.1

99.0 (99.0 ± 1.3)

98.2 (98.0 ± 1.5)

Elevator Down

40.8

108.6

13.1

0

0

70.0 (83.7 ± 10.5)

Elevator Up

79.5

0

190.4

0

0

75.5 (82.9 ± 12.1)

Stairs Down

33

0

0

166.3

0

69.7 (78.4 ± 33.3)

Stairs Up

52.8

0

0

0

188

75.4 (78.3 ± 15.2)

  

EPOCH-BP

Reference

Flat

23144

68

40

140

152

98.8 (98.9 ± 0.1)

96.9 (97.2 ± 0.2)

Elevator Down

32

88

52

0

0

45.8 (66.7 ± 54.1)

Elevator Up

32

56

76

0

0

45.8 (67.6 ± 27.7)

Stairs Down

48

0

0

124

4

56.2 (57.1 ± 31.3)

Stairs Up

48

0

0

0

124

55.3 (61.5 ± 15.8)

  

H-FISnoFIT

Reference

Flat

22682.6

18.7

25.7

57.6

37.7

98.4 (98.5 ± 1.7)

96.8 (96.5 ± 2.1)

Elevator Down

188.5

129.2

13.8

0

0

53.9 (71.3 ± 27.0)

Elevator Up

189.6

0

195

0

0

63.0 (72.4 ± 29.0)

Stairs Down

119

0

0

208.6

0

68.9 (60.7 ± 11.9)

Stairs Up

120.2

0

0

11.8

220.4

72.2 (73.6 ± 13.8)

  1. Walking and standing activities are separated in the confusion matrix to further characterize the error. Each confusion matrix is expressed in seconds. For the CCR and the F-score, the median and interquartile range are provided (computed across patients)