Table 7.

Multiple linear regression analysis: the effect of variables.

Variables	Beta	Beta∗	Estimate	|T|	P	95% CI for estimated
Constant	β0		982.679	7.72	0.001	[730.7 to 1234.7]
Sex	β1	−0.086	−17.706	0.78	0.440	[−62.5 to 27.1]
Age (years)	β2	0.276	2.338	3.65	0.001	[1.1 to 3.6]
Blood volume (L)	β3	−0.502	−91.298	4.58	0.001	[−130.8 to −51.8]
Heart rate (times/min)	β4	−0.164	−1.393	2.18	0.032	[−2.7 to −0.1]

∗: Standard beta R² = 0.309.