TABLE 5.

Low hemoglobin deferral rates 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	5.0	5.2	0.58	3.8	0.63
No information or treatment	5.1	10.7	0.0004	4.9	0.80
Iron 38 mg × 60 days	5.2	3.1	0.09	9.4	0.03
Iron 19 mg × 60days	5.1	3.2	0.06	7.5	0.07
Placebo × 60 days	3.7	8.3	0.0006	4.8	0.42
Test for differences across group assignments§	p = 0.73	p = 0.0002		p = 0.59

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

^†The deferral rate was calculated as: # of hemoglobin deferrals % (# of deferrals + successful and quantity-not-sufficient donations).

^‡Test for change from pre-STRIDE from repeated measures model (see Materials and Methods).

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