Table 1. Incidence of adverse events with donor characteristics.

	Sample	Adverse events	No adverse events
		n (%)	n (%)
	18,936	208 (1.1)	18,728(98.9)
Gender
Male	18,676	205 (1.1)	18,471(98.9)
Female	260	3 (1.2)	257 (98.8)
		χ2 = 0.007, p = 0.931
Age (years)
<30	8,621	130 (1.5)	8491(98.5)
≥30	10,315	78 (0.8)	10,237(99.2)
		χ2 = 24.30, p<0.001*
Weight (Kg)
<75	6,019	99 (1.6)	5,920(98.4)
≥75	12,917	109 (0.8)	12,808(99.2)
		χ2 = 24.25, p<0.001*
Donation history
First time donor	9,010	144 (1.6)	8,866 (98.4)
Previous donor	9,926	64 (0.6)	9,862 (99.4)
		χ2 = 39.38, p<0.001*
Hemoglobin level (g/dl)
12.5–13.0	440	2 (0.5)	438 (99.5)
13.1–14.0	1,641	12 (0.7)	1,629 (99.3)
14.1–15.0	3,381	23 (0.7)	3,358 (99.3)
> 15	13,474	171 (1.3)	13,303 (98.7)
		χ2 = 12.77, p = 0.005*
Blood pressure
Normal/prehypertensive	14,860	167 (1.1)	14,693 (98.9)
Hypertension	4,076	41 (1.0)	4,035 (99.0)
		χ2 = 0.410, p = 0.522

n: frequency,

%: percentage,

χ2: Chi-square,

p: p-value,

*: significance at <0.05, g/dl: gram per deciliter.