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. 2022 May 27;40(30):4046–4056. doi: 10.1016/j.vaccine.2022.05.059

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Fig. 2 — Levels of IgG against the SARS-CoV-2 receptor binding domain (RBD) in the health care worker cohort stratified by demographic parameters. A) Concentrations of serum IgG against the SARS-CoV-2 receptor binding domain (RBD) in all participants over 5 months following vaccination. B–E) The dynamics of IgG levels were assessed according to age groups (B), sex (C), body mass index (BMI) (D), and smoking habit (E). Symbols represent geometric mean titres (GMT) of the IgG. Error bars represent 95% CI. Statistical tests used: A) non-parametric Kruskal-Wallis followed by multiple comparisons; B–D) non-parametric multiple comparisons (Mann Whitney U) test. P value < 0.0125 was considered significant.