Table 5. Forenoon and afternoon antibody response in the participants after the second dose of COVID-19 vaccination in the younger vs. older groups.

The Student's t-test was applied. A p-value of <0.05 is considered significant.

Age Group of Participants	Antibody Response 30 days After the Second Dose of Vaccine (AU/mL)		p-value
	Forenoon vaccination (9 am to 12 noon)	Afternoon vaccination (12 noon to 5 pm)
18-25 years	92547.42 ± 147027.03	26566.25 ± 10967.28	0.40
26-50 years	32257.6 ± 11118.04	27821.58 ± 10530.974	0.45
p-value (t-test)	0.38	0.84	-