Results of multiple regression analyses of left ventricular output (LVO) as a function of postnatal age and haematocrit
| Global and partial coefficient of correlation | B |
Standard error of B | p Value | |
| Closed duct (n = 84) A = 545 (57) ml/min | ||||
| LVO estimate | r = 0.69 | 72 ml/kg/min | p < 0.00001 | |
| X1 = haematocrit (%) | r = −0.48 | −5.48 | 1.1 | p < 0.00001 |
| X2 = postnatal age (days) | r = 0.15 | 1.86 | 1.3 | NS |
| Open duct (n = 59) A = 579 (112) ml/min | ||||
| LVO estimate | r = 0.64 | 137 ml/kg/min | p < 0.00001 | |
| X1 = haematocrit (%) | r = −0.27 | −5.5 | 2.4 | p < 0.05 |
| X2 = postnatal age (days) | r = 0.46 | 25.4 | 6.6 | p < 0.001 |
LVO = A + B1X1+ B2X2