Multivariate regression analysis for FMD and TR jet velocity
| . | Parameter estimate . | SE . | 95% CI . | P value . |
|---|---|---|---|---|
| Multivariate linear regression analysis TR jet velocity (cm/s) (n = 73) | ||||
| ln(plasma free Hb) | 13.9 | 6.1 | 1.8 to 26.1 | .025 |
| Transfusion status (CT) | −12.5 | 5.8 | −24.1 to −0.8 | .037 |
| Height | 0.55 | 0.27 | 0.01 to 1.10 | .045 |
| LDH | 0.01 | 0.01 | −0.002 to 0.03 | .102 |
| Hct | −1.36 | 0.98 | −3.3 to 0.6 | .167 |
| Multivariate linear regression analysis FMD (%) (n = 61) | ||||
| ln(plasma free Hb) | −1.21 | 0.43 | −2.1 to −0.4 | .007 |
| Height | −0.05 | 0.02 | −0.1 to −0.01 | .03 |
| Hematocrit | 0.11 | 0.07 | −0.03 to 0.26 | .12 |
| Sex (female) | 0.53 | 0.33 | −0.13 to 1.18 | .11 |
| HbS% | 0.001 | 0.01 | −0.02 to 0.03 | .88 |
| . | Parameter estimate . | SE . | 95% CI . | P value . |
|---|---|---|---|---|
| Multivariate linear regression analysis TR jet velocity (cm/s) (n = 73) | ||||
| ln(plasma free Hb) | 13.9 | 6.1 | 1.8 to 26.1 | .025 |
| Transfusion status (CT) | −12.5 | 5.8 | −24.1 to −0.8 | .037 |
| Height | 0.55 | 0.27 | 0.01 to 1.10 | .045 |
| LDH | 0.01 | 0.01 | −0.002 to 0.03 | .102 |
| Hct | −1.36 | 0.98 | −3.3 to 0.6 | .167 |
| Multivariate linear regression analysis FMD (%) (n = 61) | ||||
| ln(plasma free Hb) | −1.21 | 0.43 | −2.1 to −0.4 | .007 |
| Height | −0.05 | 0.02 | −0.1 to −0.01 | .03 |
| Hematocrit | 0.11 | 0.07 | −0.03 to 0.26 | .12 |
| Sex (female) | 0.53 | 0.33 | −0.13 to 1.18 | .11 |
| HbS% | 0.001 | 0.01 | −0.02 to 0.03 | .88 |
Univariate candidate variables were input to multivariate linear regression first by stepwise analysis and second using the method of least squares analysis. The results provide insight into the most significant variables that predict TR jet velocity and flow-mediated dilation of the brachial artery. Bold P values indicate significant differences, P < 0.05.