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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

FactorsNo. of lesionsIntra-observer agreementInterobserver agreement
AIO windowConventional windowAIO windowConventional window
Overall3680.986 (0.983–0.989)0.991 (0.989–0.993)0.982 (0.979–0.985)0.979 (0.975–0.982)
Experience level
 Resident3680.987 (0.983–0.989)0.993 (0.991–0.994)0.984 (0.980–0.987)0.971 (0.965–0.976)
 Junior staff member3680.982 (0.978–0.986)0.991 (0.989–0.993)0.983 (0.979–0.986)0.980 (0.976–0.984)
 Senior staff member3680.991 (0.988–0.992)0.991 (0.989–0.993)0.981 (0.977–0.985)0.984 (0.980–0.987)
Window setting
 Lung1340.980 (0.967–0.985)0.991 (0.987–0.993)0.975 (0.968–0.981)0.982 (0.977–0.986)
 Soft2340.987 (0.984–0.990)0.991 (0.989–0.993)0.983 (0.980–0.986)0.977 (0.973–0.982)
Sharpness
 Well-defined1970.989 (0.985–0.992)0.992 (0.989–0.994)0.986 (0.983–0.989)0.985 (0.981–0.988)
 Ill-defined1710.983 (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-defined490.940 (0.897–0.966)0.943 (0.903–0.968)0.945 (0.918–0.965)0.943 (0.916–0.964)
 Lung, ill-defined850.979 (0.967–0.986)0.992 (0.988–0.995)0.974 (0.965–0.982)0.982 (0.975–0.987)
 Soft, well-defined1480.990 (0.985–0.993)0.993 (0.990–0.995)0.987 (0.983–0.990)0.985 (0.982–0.989)
 Soft, ill-defined860.983 (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
 < 101030.720 (0.606–0.804)0.781 (0.693–0.845)0.649 (0.574–0.723)0.658 (0.584–0.730)
 10–191590.828 (0.772–0.871)0.881 (0.842–0.912)0.755 (0.706–0.800)0.729 (0.678–0.779)
 ≥ 201060.980 (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