How to Motivate Whole Blood Donors to Become Plasma Donors

Table 1

Mean frequency of plasma donations at 6 months ( = 924).

Conditions	6 months
	M	SD
Information only by nurse	0.327b	0.819
Information plus self-positive image by nurse	0.439c	1.191
Control	0.135a	0.648

Note. Means within each column that do not share the same subscript differ significantly ( < .05, 2-tailed test).