Table 2:

Areas under the receiver operating characteristic curve for cardiac chamber enlargement and interobserver agreement

VariableArea under the curve (95% CI)Interobserver agreement ICC (95% CI)*
CXR measurement
 Heart (maximum single measurement), cm0.827 (0.760–0.894)0.985 (0.958–0.993)
 Heart (right plus left), cm0.816 (0.747–0.885)0.941 (0.899–0.966)
CTR
 Single heart measurement/maximum chest0.788 (0.715–0.861)0.986 (0.972–0.993)
 Single heart measurement/chest at diaphragm0.762 (0.684–0.841)0.985 (0.966–0.992)
 Single heart measurement/chest at mid heart0.764 (0.686–0.842)0.966 (0.548–0.990)
 Right plus left heart/maximum chest0.779 (0.704–0.854)0.939 (0.900–0.965)
 Right plus left heart/chest at diaphragm0.757 (0.677–0.836)0.940 (0.898–0.966)
 Right plus left heart/chest at mid heart0.757 (0.678–0.837)0.937 (0.892–0.963)
  • Note: CI = confidence interval, CTR = cardiothoracic ratio, CXR = chest radiography, ICC = intraclass correlation coefficient.

  • * We calculated ICC only for a subset of 50 patients.