TABLE 4.

Number of red blood cell equivalent donations per year during pre-STRIDE, STRIDE, and post-STRIDE, N = 692 donors

Group assignment*	Pre-STRIDE	STRIDE	p value†	Post-STRIDE	p value†
Iron status information only	3.88	3.42	0.0001	3.28	0.0001
No information or treatment	3.87	3.48	0.007	3.69	0.0002
Iron 38 mg × 60 days	3.90	3.94	0.49	3.61	0.03
Iron 19 mg × 60 days	3.98	4.01	0.25	3.81	0.0009
Placebo × 60 days	3.85	3.62	0.28	3.39	0.0002
p value‡	0.91	0.0008		0.22

^*All donors are included. Group assignments are specified in Fig. 1.

^†Test for change from pre-STRIDE to STRIDE and post-STRIDE using repeated measures model (see Materials and Methods).

^‡Test for common differences among group assignments from repeated measures model (see Materials and Methods).