Table 4. Multiple correlation analyses of [EPO] with [hemopexin + total heme].

	Estimate	Std. Error	t-value	Pr (>|t|)
(Intercept)	227.5893	41.9219	5.429	2.77e-07
Hemopexin	-0.4708	0.1268	-3.713	0.0003
Total heme	0.1330	0.3660	0.363	0.7169

The estimated coefficient (Estimate) corresponds to the fitted variable value, the standard error (Std. Error) indicates the variability of the estimated coefficient, the t-value measures whether or not the estimated coefficient for this variable is meaningful for the model, and the variable p-value (Pr (>|t|)) indicates the probability that the variable is not relevant in the model. R = 0.45 CI (0.302–0.577); p-value = 0.0001.