Finally, between trimesters 1 and 3 (response timeframe) as well as between trimester 3 and 12 weeks postpartum (flare timeframe), we employed linear regression to confirm the within-individual association of DAS28(3)-CRP [ΔDAS28(3)-CRP] with glycosylation (Δglycosylation) (Table S7 in Supplementary Material). In both timeframes, ΔDAS28(3)-CRP showed a negative association with the Δgalactosylation of IgG-Fc type species (ΔA2S0G, responder, βΔA2S0G = −0.29 ± 0.07; flare, βΔA2S0G = −0.35 ± 0.07; ΔA2FS0G, responder, βΔA2FS0G = −0.29 ± 0.07; flare, ΔA2FS0G; βΔA2FS0G = −0.33 ± 0.07), whereas the sialylation of triantennary fucosylated species showed in both cases a positive association (ΔA3FGS, responder, βΔA3FGS = 0.26 ± 0.07; flare, βΔA3FGS = 0.35 ± 0.07) (Figure 5). The flare timeframe additionally showed a positive association of ΔDAS28(3)-CRP with the (α2,6)-sialylation of (fucosylated) diantennary glycans (ΔA2GE, βΔA2GE = 0.27 ± 0.07; ΔA2FGS, βΔA2FGS = 0.24 ± 0.07).