. 2022 Jul 3;123:143–144. doi: 10.1016/j.ijid.2022.06.051

Table 1.

Anti-spike IgG levels (in terms of median and geometric mean) among seropositive individuals before 1^st dose of vaccination (SP), history of COVID-19 RT-PCR positive before 1^st dose of vaccination (CP), SP + one dose of vaccine (SP1), seronegative (SN) + two doses (SN2), CP + one dose of vaccine (CP1) and COVID RT-PCR negative (CN) + two doses (CN2)

Group	n	Anti-spike IgG levels (AU/ml) Median (IQR)	–p-value	Anti-spike IgG levels (AU/ml) Geometric Mean ± SD	–p-value
Seropositive before 1^st dose of vaccination (SP)	1119	39.9 (25.7 – 67.6)	0.379	42.30±1.85	0.001^a
History of COVID-19 RT-PCR positive before 1^st dose of vaccination (CP)	472	41.3 (20.5 – 78.6)	0.379	35.68±2.86	0.001^a
SP + one dose of vaccine (SP1)	581	1200 (320 – 2680)	< 0.0001^a	906.69±3.40	< 0.0001^a
Seronegative (SN) + two doses (SN2)	420	111 (67 – 217)	< 0.0001^a	117.09±2.89	< 0.0001^a
CP + one dose of vaccine (CP1)	214	1573.2 (308.0 – 2770.0)	< 0.0001^a	896.65±4.86	< 0.0001^a
COVID RT-PCR negative (CN) + two doses (CN2)	838	418.4 (97.9 – 387.0)	< 0.0001^a	202.49±3.26	< 0.0001^a

P-value < 0.05, statistically significant; IQR , Inter Quartile Range.