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Table 4—

Age-adjusted fasting and stimulated C-peptide levels, by markers of β-cell autoimmunity, in incident cases of type 1 diabetes in the province of Turin, Italy, from 1984 to 2000

Fasting C-peptide [nmol/l (95% CI)]Stimulated C-peptide [nmol/l (95% CI)]
ICA− 0.13 (0.10–0.16) 0.43 (0.35–0.52) 
ICA+ 0.10 (0.15–0.26) 0.27 (0.22–0.32) 
    P 0.14 0.01 
GADA− 0.17 (0.13–0.22) 0.31 (0.24–0.40) 
GADA+ 0.15 (0.12–0.18) 0.34 (0.28–0.40) 
    P 0.17 0.91 
IA2− 0.20 (0.14–0.29) 0.42 (0.32–0.54) 
IA2+ 0.13 (0.10–0.18) 0.32 (0.25–0.41) 
    P 0.43 0.42 
Fasting C-peptide [nmol/l (95% CI)]Stimulated C-peptide [nmol/l (95% CI)]
ICA− 0.13 (0.10–0.16) 0.43 (0.35–0.52) 
ICA+ 0.10 (0.15–0.26) 0.27 (0.22–0.32) 
    P 0.14 0.01 
GADA− 0.17 (0.13–0.22) 0.31 (0.24–0.40) 
GADA+ 0.15 (0.12–0.18) 0.34 (0.28–0.40) 
    P 0.17 0.91 
IA2− 0.20 (0.14–0.29) 0.42 (0.32–0.54) 
IA2+ 0.13 (0.10–0.18) 0.32 (0.25–0.41) 
    P 0.43 0.42 
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