Table 6.

Distribution of male blood donors with normal and abnormal plasma vitamin D3, ferritin, and uric acid concentrations

Variable	Regular donors		1st-time donors		χ2	p-values
	Number	%	Number	%
Vitamin D3					0.1a	0.7
Low	95	95.1	96	96.0
Normal	5	5.0	4	4.0
(>30 ng/mL)
Serum ferritin					21.2a	<0.001
Low	25	25.0	3	3.0
Normal	74	74.0	93	93.0
(30–400 ng/L)
High	1	1.0	4	4.0
Serum uric acid					1.8	0.1
Normal	73	73.0	81	81.0
(3.3–7 mg/dL)
High	27	27.0	19	19.0

Note:

^aFishers exact test.