Table 2. Results of serum calcium and total serum protein in donors, separately for normal and abnormal^*.

Variables		Abnormal group	Normal group	Total
Serum calcium	n (n, %)	815, 20.55%	3,151, 79.45%	3,966
	mean (mmol/L)	2.07 ± 0.93	2.36 ± 0.93***	2.30 ± 0.15
Total serum protein	n (n, %)	1,111, 27.99%	2,858, 72.01%	3,969
	mean (g/L)	60.26 ± 4.01	70.67 ± 3.72***	67.75 ± 6.02

Notes.

^*Data are reported as mean (±SD) or number (%).

^***p < 0.001 (the comparison between abnormal group and normal group was conducted using two-tailed unpaired Student’s t -tests).