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

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

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

The bold values indicated the selected regression model for computation of LAVI from LAAPI
LVEF left ventricular ejection fraction, LAAPI left atrial anteroposterior diameter index, LAVI left atrial volume index

ISSN: 1471-2261