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Epidemiologic features differentiating type 1 from type 2 diabetes mellitus
| Characteristic | Type 1 DM | Type 2 DM |
| Age (yr, at diagnosis) | < 25 | > 25 |
| Onset | Abrupt | Gradual |
| Body Habitus | Lean (weight < 105% of IBW) | Overweight/Obese (weight > 115% of IBW) |
| HLA-association | Yes | No |
| C-peptide | Undetectable | Detectable |
| Ketoacidosis | Yes | No |
| Immediate need for insulin | Yes | No |
DM: Diabetes mellitus; IBW: Ideal body weight; HLA: Human leukocyte antigen.
