Table 3.
Results of stepwise multiple regression analysis for variables predicting accuracy of pulmonary annular motion parameters
| Objective variable | Explanatory variables | B | SE | β | p values | VIF |
|---|---|---|---|---|---|---|
| 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 |
B unstandardized coefficient, SE standard error, β standardized partial regression coefficient, VIF variance inflation factor, sPAC systolic pulmonary arterial capacitance, dPAC diastolic pulmonary arterial capacitance, SPAP systolic pulmonary arterial pressure, RVSP right ventricular systolic pressure, RVEDP right ventricular end-diastolic pressure, Qp/Qs pulmonary to systemic blood flow ratio, n.a. not available