Table 3. Frequency of mild and severe adverse events post blood donation.

Adverse events	n(%)*
Mild
Chills	4 (1.9)
Nausea	20(9.6)
Pallor	157 (75.5)
Dizziness	176(84.6)
Nervousness	7(3.4)
Headache	2(1.0)
Severe
Hypotension	30 (14.4)
Muscle contractions and convulsions	12(5.8)
Syncope	27(13.0)
Respiratory problems	5(2.4)
Emesis	14(6.7)
Diaphoresis	19(9.1)

n: frequency,

%: percentage,

*: non-mutually exclusive