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Table 1 Repeatability Index (RepI), Repeatability Coefficient (RepC) and Confidence-Step-Analysis (CSA) values for Echocardiographic Parameters in Preterm Infants with Suspected Patent Ductus Arteriosus

From: Repeatability of echocardiographic parameters to evaluate the hemodynamic relevance of patent ductus arteriosus in preterm infants: a prospective observational study

Parameter N CSA Repeatability Coefficient Repeatability Index
RepC 95 % CI RepI [%] 95 % CI
RI_CA 23 6.5 0.09 0.07–0.13 11 9–17*
RI_ACA 23 4.1 0.11 0.08–0.16 14 11–20**
LA/Ao 23 4.9 0.23 0.17–0.33 16 12–23
LVPEP/LVET 27 3.3 0.08 0.06–0.11 23 18–32
VTI_Ao/VTI_Pa 23 8.2 0.28 0.21–0.40 26 20–38
PDA - diameter 6 7.6 0.28 0.15–1.47 21 12–112
  1. RI (resistance index) in CA (celiac artery) and ACA (anterior cerebral artery), LA/Ao-ratio (Left-atrium-to-aortic-root-ratio), LVPEP/LVET (left-ventricular-preejection-period-to-ejection-time-ratio), VTI_Ao/VTI_Pa (ratio of the velocity time integrals in the large vessels) and PDA diameter (patent ductus arteriosus); 95 % CI (95 % confidence interval) significantly smaller than RepI of LVPEP/LVET and VTI_Ao/VTI_Pa marked with “ * ”, “significantly” smaller than RepI of VTI_Ao/VTI_Pa marked with “ ** ”