Fig. 6.

Correlation of S1-specific IgG decline with demographic parameters. Correlation of log transformed decline rates of SARS-CoV-2 S1-specific IgG concentrations between four weeks and six months after the 2nd dose with A) BMI and B) age of healthy control subjects (n = 66), and C) BMI and D) age of IBD patients (n = 130); Spearman rank correlation coefficient (r_s) for log transformed S1-specific IgG decline rates and BMI (r_s = −0.374, p = 0.003), and age (r_s = −0.213, p = 0.09) in healthy controls. Abbreviations: BMI, body mass index; IBD, inflammatory bowel disease. ∗∗p ≤ 0.01.