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Table 4 Two way contingency table analysis showing predictive accuracy of the nomogram

From: Postoperative nomogram to predict the probability of metastasis in Enneking stage IIB extremity osteosarcoma

Ā 

Training set

Validation set

Ā 

Observed (N)

Observed (N)

Ā 

Metastasis positive

Metastasis free

Total

Metastasis positive

Metastasis free

Total

Expected (N)

Metastasis positive

28

13

41

14

2

16

Ā 

Metastasis free

6

44

50

4

14

18

Ā 

Total

34

57

91

18

16

34

Accuracy % (95% CI)

79.1 (0.69 to 0.86)

82.4 (0.63 to 0.92)

Sensitivity % (95% CI)

82.4 (0.69 to 0.92)

77.8 (0.60 to 0.87)

Specificity % (95% CI)

77.2 (0.69 to 0.83)

87.5 (0.67 to 0.98)

PPV % (95% CI)

68.3 (0.57 to 0.76)

87.5 (0.67 to 0.98)

NPV % (95% CI)

88.0 (0.79 to 0.95)

77.8 (0.60 to 0.87)

PLR (95% CI)

3.61 (2.21 to 5.36)

6.22 (1.83 to 35.63)

NLR (95% CI)

0.23 (0.10 to 0.456)

0.25 (0.14 to 0.60)

DOR (95% CI)

15.80 (4.84 to 54.44)

24.5 (3.07 to 261.90)

  1. Abbreviations: CI confidential interval, PPV positive predictive value, NPV negative predictive value, PLR positive likelihood ratio, NLR negative likelihood ratio, DOR diagnostic odds ratio.