On univariate analysis, participants who remained off insulin at 5 years presented with less severe acidosis (measured by pH or bicarbonate) during the initial DKA admission, were more likely to be obese (BMI 30–39.9 kg/m2) and acanthosis nigricans was present more often; fasting C-peptide was higher and anti-GAD antibodies were negative (in all except one participant). Here, GAD1 is linked to acanthosis nigricans.