Table S1.
ICD-9 codes of diseases in first-degree relatives of patients with type 1 diabetes
| Diseases | ICD-9 code | Definition |
|---|---|---|
| Type 1 diabetes | 250 | Catastrophic illness certificates |
| Simple goiter | 240 | Two outpatient records |
| Non-toxic nodular goiter | 241 | Two outpatient records |
| Thyrotoxicosis | 242 | Two outpatient records |
| Acquired hypothyroidism | 244 | Two outpatient records |
| Thyroiditis | 245 | Two outpatient records |
| Rheumatoid arthritis | 7140 | Catastrophic illness certificates |
| Sjögren’s syndrome | 7102 | Catastrophic illness certificates |
| Systemic lupus erythematosus | 7100 | Catastrophic illness certificates |
| Systemic sclerosis | 7101 | Catastrophic illness certificates |
| Polymyositis/dermatomyositis | 7103, 7104 | Catastrophic illness certificates |
| Behçet’s disease | 1361 | Catastrophic illness certificates |
| Vasculitis | 4431, 4460, 4461, 4462, 4464, 4465, 4467 | Catastrophic illness certificates |
| Inflammatory bowel disease | 555, 5560, 5561, 5562, 5563, 5564, 5565 5566, 5567, 5568, 5569 | Catastrophic illness certificates |
| Multiple sclerosis | 340 | Catastrophic illness certificates |
| Myasthenia gravis | 358 | Catastrophic illness certificates |
| Epilepsy | 345 | Two outpatient records of hospitalization records |