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| Characteristics | n | % |
|---|---|---|
| Age | ||
| Median (range) | 42 (17–18) | |
| Gender | ||
| Male | 87 | 67.4 |
| Female | 42 | 32.6 |
| Ethnicity | ||
| Chinese | 84 | 65.1 |
| Malay | 12 | 9.3 |
| Indian | 31 | 24.0 |
| Others | 2 | 1.6 |
| Clinical indications of thiopurine therapy | ||
| Crohn's disease | 89 | 69.0 |
| Ulcerative colitis | 40 | 31.0 |
| Thiopurine drug received | ||
| Azathioprine | 127 | 98.4 |
| 6-mercaptopurine | 2 | 1.6 |
| Concurrent medications at thiopurine initiation | ||
| 5-aminosalicylates | 83 | 64.3 |
| Corticosteroids | 87 | 67.4 |
