HNF4A and diabetes mellitus: At onset of diabetes, the MODY‐positive subjects were significantly older (mean age 13.8 vs. 10.6 yr, respectively, p = 0.008) and had a lower HbA1c [7.9 vs. 10.6% (62.5 vs. 92.2 mmol/mol), respectively, p < 0.0001] compared with the MODY‐negative subjects.