TABLE 3.

Mean arterial pressure (MAP) Multivariate Regression Solution. Donor MAP (mmHb) was regressed on the main effects of arm (Control and TRT) plus the interactions of arm with body mass index (BMI), the mean donation interval (mean interval) and the interval from the first donation in the 365-day study period. p values indicate the significance of the effect (i.e., parameter not equal to zero). n(control) = 12,297 n(TRT) = 2597

Effect	Parameter estimate	SE	p
ARM control	79.0	0.3170	<0.0001
ARM TRT	87.8	0.8307	<0.0001
BMI*control	0.5655	0.0099	<0.0001
BMI*TRT	0.3845	0.0252	<0.0001
Mean interval*control	0.0042	0.0008	<0.0001
Mean interval*TRT	−0.0003	0.0021	0.8881
Interval*control	−0.0003	0.0004	0.5133
Interval*TRT	−0.0046	0.0009	<0.0001