Determinants and Regression Equations for the Calculation of Scores of Left Ventricular Tissue Doppler Longitudinal Indexes in a Healthy Italian Pediatric Population

Table 4

Coefficients for regression equations relating left ventricular longitudinal indexes and age. For each index, application of the corresponding third-grade equation provides the expected logarithmic value according to age. In a patient with given age, this allows calculation of the score that corresponds to the observed value of the index in that patient (see text).

	Age^3	Age^2	Age	Intercept	MSE
	8.3 ⋅ 10^−5	−1.9 ⋅ 10^−3	0.031	2.01	0.161	0.24
	2.6 ⋅ 10^−4	−8.4 ⋅ 10^−3	0.088	2.45	0.141	0.24
	2.8 ⋅ 10^−5	2.3 ⋅ 10^−3	−0.040	2.03	0.200	0.11
ratio	−1.9 ⋅ 10^−4	7.5 ⋅ 10^−3	−0.097	2.15	0.198	0.25

: peak late diastolic transmitral flow velocity; : peak late diastolic annulus velocity; : peak early diastolic transmitral flow velocity; : peak early diastolic annulus velocity.