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Table 4 Receiver operating characteristic curve analysis of the optimal cutoff age for developing delirium

From: Incidence of and risk factors for postoperative delirium in older adult patients undergoing noncardiac surgery: a prospective study

Cut point

Sensitivity (%)

Specificity (%)

PPV

NPV

LR+

LR-

Accuracy

(95% CI)

Youden’s Index

≥ 65

100.00

9.09

12.66

100.0

1.10

0.00

19.68% (14.9–25.2)

0.09

≥ 70

96.55

21.82

14.00

97.96

1.23

0.16

30.52% (24.9–36.6)

0.18

≥ 75

79.31

53.64

18.40

95.16

1.71

0.39

56.63% (50.2–62.9)

0.34

≥ 80

51.72

75.91

22.06

92.27

2.15

0.64

73.09% (67.1–78.5)

0.28

≥ 85

31.03

91.82

33.33

90.99

3.79

0.75

84.74% (79.7–89.0)

0.23

  1. Abbreviations: PPV positive predictive value, NPV negative predictive value, LR+ positive likelihood ratio, LR- negative likelihood ratio, AUC area under the curve, 95% CI 95% confidence interval
  2. The optimal cutoff age was age ≥ 75 years with the best sensitivity and Youden's index
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BMC Geriatrics

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