Table 3 Results of stepwise multiple regression analysis for variables predicting accuracy of pulmonary annular motion parameters

s1′ (cm/sec)

sPAC

0.41

0.16

0.41

0.0131

1.76

dPAC

0.95

0.43

0.34

0.0354

1.74

RVEDP

−0.37

0.11

−0.39

0.0021

1.02

s2′ (cm/sec)

sPAC

0.24

0.05

0.62

<0.0001

1.00

e’ (cm/sec)

sPAC

0.37

0.19

0.35

0.0314

2.08

RVSP

−0.05

0.02

−0.28

0.0432

1.71

RVEDP

0.46

0.12

0.42

0.0005

1.04

a’ (cm/sec)

n.a.

-

-

-

-

-

ICT (msec)

n.a.

-

-

-

-

-

IRT (msec)

n.a.

-

-

-

-

-

s1′ duration (msec)

sPAC

3.76

1.17

0.49

0.0029

1.00

s2′ duration (msec)

Qp/Qs

−12.71

4.19

−0.47

0.0047

1.00

e’ duration (msec)

n.a.

-

-

-

-

-

a’ duration (msec)

sPAC

2.66

1.30

0.27

0.0488

1.11

Qp/Qs

−9.19

3.18

−0.44

0.0070

1.48