TABLE II. Geometric mean titres (GMT) of coronavirus disease 2019 (Covid-19) IgG antibodies (Elisa) and ratio of GMT post (variable timing) and pre-booster by study group.

Collection time	Group		Ratio (Post/Pre)		CI (95% for the ratio)
	Eight weeks	12 weeks	Eight weeks	12 weeks	Eight weeks	12 weeks
Pre 3rd dose	1453.5	1712.1	-	-	-	-
28 days post 3rd dose	5529.9	5425.4	3.8	3.2	(2.6; 5.6)	(2.4; 4.3)
Three months post 3rd dose	5546.2	5614.0	3.8	3.3	(2.6; 5.6)	(2.4; 4.4)
Six months post 3rd dose	6371.8	5423.0	4.4	3.2	(3; 6.4)	(2.4; 4.2)
12 months post 3rd dose	5926.4	6459.2	4.1	3.8	(2.8; 5.9)	(2.9; 5)