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Table 5 Summary of statistical results for “low-dose” and “ultra-low-dose” CT protocols in patients (≥ 80-kg body weight)

From: Ultra-low-dose chest CT protocol during the second wave of COVID-19 pandemic: a double-observer prospective study on 250 patients to evaluate its detection accuracy

Statistical results:

Low-dose CT (45 mAs)

Ultra-low-dose CT (22 mAs)

Observer 1

Observer 2

Observer 1

Observer 2

Value

95% CIa

Value

95% CI

Value

95% CI

Value

95% CI

Sensitivity

97.84%

93.82 to 99.55%

97.84%

93.82 to 99.55%

93.53%

88.06 to 97.00%

96.40%

91.81 to 98.82%

Specificity

42.86%

9.90 to 81.59%

42.86%

9.90 to 81.59%

42.86%

9.90 to 81.59%

42.86%

9.90 to 81.59%

Positive predictive value (PPV)

97.14%

94.71 to 98.48%

97.14%

94.71 to 98.48%

97.01%

94.47 to 98.41%

97.10%

94.63 to 98.45%

Negative predictive value (NPV)

50.00%

19.64 to 80.36%

50.00%

19.64 to 80.36%

25.00%

10.32 to 49.12%

37.50%

15.13 to 66.88%

Positive likelihood ratio

1.71

0.90 to 3.25

1.71

0.90 to 3.25

1.64

0.86 to 3.11

1.69

0.89 to 3.21

Negative likelihood ratio

0.05

0.01 to 0.21

0.05

0.01 to 0.21

0.15

0.05 to 0.44

0.08

0.02 to 0.28

Accuracy

95.21%

90.37 to 98.05%

95.21%

90.37 to 98.05%

91.10%

85.26 to 95.17%

93.84%

88.62 to 97.14%

  1. aCI confidence interval