Abstract
<p><b>Objective.</b> To examine sex differences in children with newly diagnosed type 1 diabetes (T1D) with respect to age at diagnosis, presence of autoantibodies (GADA, IA-2A, IAA, and ZnT8A), and HLA risk.</p><p><b>Research design and Methods. </b>A population-based nationwide sample of 3,645 Swedish children at T1D diagnosis was used.</p><p><b>Results. </b>Girls were younger at T1D diagnosis (9.53 vs 10.23 years; <i>P</i> < .001), more likely to be autoantibody-positive (94.7% vs 92.0%; <i>P</i> = .002), more often positive for multiple autoantibodies (P < .001), more likely to be positive for GADA (64.9% vs 49.0%; <i>P</i> < .001) and less likely to be positive for IAA (32.3% vs 33.8%; <i>P</i> = .016). Small sex differences in HLA risk were found in children under 9 years of age.</p><p><b>Conclusions. </b>The disease mechanisms leading to T1D may influence the immune system differently in girls and boys.</p>
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