Table 2 Sensitivity and specificity of DECT GSI in different stages of gout

Early stage (≤1 yr)

49

38.10 (18.1–61.6)

96.43 (81.7–99.9)

0.673 (0.524–0.800)

0.003

22

55.56 (21.2–86.3)

100.00 (75.3–100.0)

0.778 (0.552–0.925)

0.002

27

25.00 (5.5–57.2)

93.33 (68.1–99.8)

0.592 (0.387–0.775)

0.211

Middle stage (≤3 yrs)

33

62.96 (42.4–80.6)

100.00 (54.1–100.0)

0.815 (0.642–0.928)

<0.001

26

59.09 (36.4–79.3)

100.00 (39.8–100.0)

0.795 (0.593–0.927)

<0.001

7

80.00 (28.4–99.5)

100.00 (15.8–100.0)

0.900 (0.467–0.999)

<0.001

Late stage (>3 yrs)

114

77.55 (68.0–85.4)

87.50 (61.7–98.4)

0.825 (0.743–0.890)

<0.001

77

75.71 (64.0–85.2)

85.71 (42.1–99.6)

0.807 (0.701–0.888)

<0.001

37

82.14 (63.1–93.9)

88.89 (51.8–99.7)

0.855 (0.700–0.949)

<0.001

Total

196

69.18 (61.0–76.5)

94.00 (83.5–98.7)

0.816 (0.754–0.868)

<0.001

125

70.30 (60.4–79.0)

95.83 (78.9–99.9)

0.831 (0.753–0.892)

<0.001

71

66.67 (51.0–80.0)

92.31 (74.9–99.1)

0.795 (0.682–0.882)

<0.001