Table 5. Positivity of autoantibodies within 0.5 year of diagnosis stratified by age at diagnosis.
| Antibody | Positive/Total (%) | ||||||
|---|---|---|---|---|---|---|---|
| All | 0.5 – <3.0 | 3.0 – <6.0 | 6.0 – <9.0 | 9.0 – <12.0 | 12.0–19.0 | Pa | |
| GADA | 397/536 (74.1) |
44/55 (80.0) |
61/97 (62.9) |
105/134 (78.4) |
97/125 (77.6) |
90/125 (72.0) |
0.046 |
| IA2A | 397/536 (74.1) |
47/55 (85.4) |
76/97 (78.4) |
104/134 (77.6) |
90/125 (72.0) |
80/125 (64.0) |
0.015 |
| GADA or IA2A | 481/536 (89.7) |
53/55 (96.4) |
88/97 (90.7) |
124/134 (92.5) |
114/125 (91.2) |
102/125 (81.6) |
0.011 |
aχ2 test (5 × 2 contingency table).
Abbreviations: GADA, Glutamic acid decarboxylase 65 kD (GAD) autoantibody; IA2A, insulinoma-associated protein 2 autoantibody.