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Table 2 Interobserver agreement demonstrated as intraclass correlation coefficient (ICC) for measuring CTR and cardiac MRI parameters

From: Limitations of cardiothoracic ratio derived from chest radiographs to predict real heart size: comparison with magnetic resonance imaging

Parameter ICC between observers
CTR 0.937 (0.869–0.97)
LVEDV 0.985 (0.962–0.994)
LVESV 0.992 (0.942–0.997)
LVEF 0.977 (0.936–0.99)
LV mass 0.984 (0.965–0.993)
RVEDV 0.846 (0.675–0.927)
RVESV 0.975 (0.919–0.99)
RVEF 0.935 (0.856–0.97)
LA volume 0.977 (0.948–0.99)
LA area 0.959 (0.914–0.98)
RA volume 0.926 (0.845–0.965)
RA area 0.91 (0.811–0.957)
  1. Values in parentheses are 95% confidence intervals
  2. ICC intraclass correlation coefficient, CTR cardiothoracic ratio, MRI magnetic resonance imaging, LVEDV left ventricular end-diastolic volume, LVESV left ventricular end-systolic volume, LVEF left ventricular ejection fraction, LV left ventricle, RVEDV right ventricular end-diastolic volume, RVESV right ventricular end-systolic volume, RVEF right ventricular ejection fraction, LA left atrium, RA right atrium