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Table 2 Best-fitting regression models for computation of LAVI from LAAPI in the derivation set

From: Validation of evaluating left ventricular diastolic function with estimated left atrial volume from anteroposterior diameter

Equation r2 F P value Constant β1 β2 β3
All subjects (n = 276)        
 Linear 0.44 218.60 < 0.001 − 13.86 2.05   
 Logarithmic 0.42 202.20 < 0.001 − 112.93 46.80   
 Quadratic 0.45 113.70 < 0.001 19.75 − 0.82 0.06  
 Cubic 0.45 113.83 < 0.001 13.77 0.00 0.02 0.0005
 Compound 0.40 182.78 < 0.001 8.55 1.06   
 Power 0.40 181.13 < 0.001 0.51 1.32   
 S 0.39 173.69 < 0.001 4.75 − 29.29   
 Growth 0.40 182.78 < 0.001 2.15 0.06   
 Exponential 0.40 182.78 < 0.001 8.55 0.06   
Subjects with normal LVEF (n = 217)        
 Linear 0.28 83.06 < 0.001 − 3.97 1.54   
 Logarithmic 0.28 82.80 < 0.001 − 74.53 33.92   
 Quadratic 0.28 41.42 < 0.001 − 10.77 2.16 − 0.01  
 Cubic 0.28 41.43 < 0.001 − 8.77 1.87 0.00 − 0.0002
 Compound 0.27 78.31 < 0.001 9.84 1.05   
 Power 0.27 81.37 < 0.001 1.00 1.09   
 S 0.28 82.61 < 0.001 4.45 − 23.44   
 Growth 0.27 78.31 < 0.001 2.29 0.05   
 Exponential 0.27 78.31 < 0.001 9.84 0.05   
Subjects with depressed LVEF (n = 59)        
 Linear 0.46 48.65 < 0.001 − 12.83 2.15   
 Logarithmic 0.45 45.92 < 0.001 − 131.36 53.79   
 Quadratic 0.47 24.53 < 0.001 20.51 − 0.48 0.05  
 Cubic 0.47 24.53 < 0.001 16.62 0.00 0.03 0.0002
 Compound 0.40 38.25 < 0.001 10.53 1.05   
 Power 0.40 38.10 < 0.001 0.57 1.31   
 S 0.39 37.00 < 0.001 4.97 − 32.05   
 Growth 0.40 38.25 < 0.001 2.35 0.05   
 Exponential 0.40 38.25 < 0.001 10.53 0.05   
  1. The bold values indicated the selected regression model for computation of LAVI from LAAPI
  2. LVEF left ventricular ejection fraction, LAAPI left atrial anteroposterior diameter index, LAVI left atrial volume index