Figure 3.

Correlation between glutamic acid decarboxylase antibody (GADA) titres and glutamic acid decarboxylase (GAD)₆₅ enzyme activity in stiff-person syndrome (SPS) (a) and type 1 diabetes mellitus (T1D) patients (b), GAD-alum treated T1D patients (c) and high-risk T1D individuals (d). Open circles in the SPS group (n = 8) represent individuals with co-existent T1D, whereas open triangles in the high-risk group (n = 3) represent individuals who developed T1D after sampling. Significant differences or trends are indicated as P-values, and the correlation coefficient as r.