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Table 2 Scoring results for each reader and interreader reproducibility analysis for dual-energy computed tomography urate volume and volume change measurements

From: Lack of change in urate deposition by dual-energy computed tomography among clinically stable patients with long-standing tophaceous gout: a prospective longitudinal study

Parameter

Volume at baseline

Volume at year 1

Change in volume at year 1

Reader 1, median (IQR)

0.59 cm3 (0.14 to 2.3)

0.60 cm3 (0.21 to 2.2)

0.00 cm3 (-0.44 to 0.48)

Reader 1, mean (SD)

2.9 cm3 (7.1)

2.3 cm3 (5.2)

-0.58 cm3 (2.6)

Reader 2, median (IQR)

0.42 cm3 (0.13 to 2.1)

0.29 cm3 (0.12 to 1.8)

-0.03 cm3 (-0.37 to 0.07)

Reader 2, mean (SD)

2.8 cm3 (6.9)

2.1 cm3 (5.2)

-0.68 cm3 (2.5)

Average (reader 1 and reader 2), median (IQR)

0.49 cm3 (0.16 to 2.2)

0.51 cm3 (0.18 to 2.1)

-0.01 cm3 (-0.40 to 0.28)

Interreader intraclass correlation coefficient (95% CI)

1.0 (0.99 to 1.0)

0.99 (0.99 to 1.0)

0.93 (0.89 to 0.96)

Interreader bias (SD)

-0.18 cm3 (0.63)

-0.27 cm3 (0.62)

-0.10 cm3 (0.93)

Smallest detectable difference, average measurement (%)

44.1%

55.2%

289%

Smallest detectable change

–

–

0.91 cm3