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Table 2 Intraclass correlation coefficients to assess intra- and interobserver variability in CT size measurement

From: Lesion measurement on a combined “all-in-one” window for chest CT: effect on intra- and interobserver variability

Factors

No. of lesions

Intra-observer agreement

Interobserver agreement

AIO window

Conventional window

AIO window

Conventional window

Overall

368

0.986 (0.983–0.989)

0.991 (0.989–0.993)

0.982 (0.979–0.985)

0.979 (0.975–0.982)

Experience level

 Resident

368

0.987 (0.983–0.989)

0.993 (0.991–0.994)

0.984 (0.980–0.987)

0.971 (0.965–0.976)

 Junior staff member

368

0.982 (0.978–0.986)

0.991 (0.989–0.993)

0.983 (0.979–0.986)

0.980 (0.976–0.984)

 Senior staff member

368

0.991 (0.988–0.992)

0.991 (0.989–0.993)

0.981 (0.977–0.985)

0.984 (0.980–0.987)

Window setting

 Lung

134

0.980 (0.967–0.985)

0.991 (0.987–0.993)

0.975 (0.968–0.981)

0.982 (0.977–0.986)

 Soft

234

0.987 (0.984–0.990)

0.991 (0.989–0.993)

0.983 (0.980–0.986)

0.977 (0.973–0.982)

Sharpness

 Well-defined

197

0.989 (0.985–0.992)

0.992 (0.989–0.994)

0.986 (0.983–0.989)

0.985 (0.981–0.988)

 Ill-defined

171

0.983 (0.977–0.988)

0.991 (0.987–0.993)

0.978 (0.973–0.983)

0.974 (0.967–0.979)

Combinations

 Lung, well-defined

49

0.940 (0.897–0.966)

0.943 (0.903–0.968)

0.945 (0.918–0.965)

0.943 (0.916–0.964)

 Lung, ill-defined

85

0.979 (0.967–0.986)

0.992 (0.988–0.995)

0.974 (0.965–0.982)

0.982 (0.975–0.987)

 Soft, well-defined

148

0.990 (0.985–0.993)

0.993 (0.990–0.995)

0.987 (0.983–0.990)

0.985 (0.982–0.989)

 Soft, ill-defined

86

0.983 (0.974–0.989)

0.989 (0.982–0.993)

0.978 (0.970–0.984)

0.969 (0.958–0.978)

Size (diameter in mm)a

 < 10

103

0.720 (0.606–0.804)

0.781 (0.693–0.845)

0.649 (0.574–0.723)

0.658 (0.584–0.730)

 10–19

159

0.828 (0.772–0.871)

0.881 (0.842–0.912)

0.755 (0.706–0.800)

0.729 (0.678–0.779)

 ≥ 20

106

0.980 (0.970–0.986)

0.987 (0.981–0.991)

0.975 (0.967–0.982)

0.967 (0.957–0.976)

  1. Note: numbers in parentheses are the 95% CIs
  2. aLesions were assigned to size categories based on the average lesion size across all measurements in conventional window setting