Table 1. General characteristics and immune response parameters of 87 CCP donors.

Gender (N, (% total group)	Male 39 (45%) Female 48 (55%)
Age (mean ± SD)	47.2 ± 14.9 years (median 47, range 20–80 years)
ABO Group (N, (% total group)	A 32 (37%, 78%Rh +) B 16 (18%, 69% Rh +) AB 3 (3%, 100% Rh +) O 36 (42%, 92% Rh +)
Neutralization IC50 (mean ± SD)	121.1 ± 133.9 (median 61.4, range <8.0–581.4) Quartile 1 <8–31 Quartile 2 32–61 Quartile 3 62–153 Quartile 4 154–581
Ortho (Ig total) S/CO value (mean ± SD)	229.6 ± 188.4 (median 203, range 0.02–904) Quartile 1 0.02–49.8 Quartile 2 50–203 Quartile 3 204–352 Quartile 4 353–904
Abbott (IgG) Index value (mean ± SD)	4.8 ± 2.0 (median 4.6, range 0.9–8.7) Quartile 1 0.9–2.9 Quartile 2 3.0–4.6 Quartile 3 4.7–6.8 Quartile 4 6.9–8.7