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Table 4 Performance of three classification decision tree model in training set and test set

From: Diet and lifestyle behaviours simultaneously act on frailty: it is time to move the threshold of frailty prevention and control forward

Data Set

Indicators

Model One

Model Two

Model Three

Train Set

Accuracy (%)

84.95

82.63

80.16

Recall (%)

24.17

86.78

83.47

Specificity (%)

95.09

78.53

76.40

Youden index

0.193

0.653

0.599

Kappa index

0.192

0.653

0.575

PPV (%)

49.13

79.97

64.46

NPV (%)

86.47

85.74

90.01

Precision (%)

98.85

78.53

80.75

F1 score (%)

38.84

82.45

82.09

AUC (95%CI)

0.627 (0.591,0.662)

0.834 (0.805,0.861)

0.832 (0.803,0.859)

Test Set

Accuracy (%)

84.35

82.75

78.59

Recall (%)

17.39

87.04

83.81

Specificity (%)

93.63

78.15

75.48

Youden index

0.110

0.652

0.593

Kappa index

0.064

0.654

0.530

PPV (%)

31.99

81.06

63.26

NPV (%)

86.80

84.87

90.25

Precision (%)

97.75

78.15

81.73

F1 score (%)

29.53

82.36

82.76

AUC (95%CI)

0.564 (0.507,0.619)

0.824 (0.777,0.864)

0.814 (0.766,0.855)

  1. PPV Positive predictive value, NPV Negative predictive value