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. 2021 Dec 8;22(4):483–495. doi: 10.1016/S1473-3099(21)00681-2

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Level of neutralising antibodies to infectious SARS-CoV-2 in adults aged 60 years and older

Dots are reciprocal neutralising antibody titres for individuals in the per-protocol population. Numbers above the bars are GMTs, and the error bars indicate the 95% CI. The dotted horizontal line represents the seropositivity threshold. Titres lower than the limit of detection (1/4) are presented as half the limit of detection. Numbers above the short horizontal lines are p values of comparisons between 1.5 μg group, 3 μg group, and 6 μg group. Only the p values indicating significant difference are marked. GMT=geometric mean titre.