High ALT levels were significantly associated with the duration of diabetes: 14.3% (CI 11.2, 17.4), 9.2% (CI 5.9, 12.6), 8.0% (CI 3.4, 12.6), and 3.7% (CI 0.9, 6.4) in patients with diabetes dating to <5, 5-10, 11-15 and >15 years respectively. This evidence concerns the gene GPT and diabetes mellitus.