Clinical Study
A Thirty-Year Follow-Up Surveillance Study for Neoplasia of a Dutch Ulcerative Colitis Cohort
Table 1
Characteristics of the patient population
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| ā | Mean (sd) | Range | years | Min. | Max. |
| Age at diagnosis | 33.8 (13.8) | 4.1 | 69.4 | Age at first surveillance colonoscopy | 44.1 (13.8) | 18.2 | 79.3 | Age at end of follow-up | 53.1 (14.8) | 21.2 | 84.0 | Time from onset of symptoms to first surveillance colonoscopy | 12.0 (4.7) | 8.0 | 38.0 | Follow-up period of intact colon* | 10.8 (6.9) | 0.1 | 27.1 | Interval between surveillance colonoscopies* | 2.0 (1.2) | 0.1 | 10.1 | Age at death | 68.1 (16.3) | 26.3 | 97.6 |
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Only patients with follow-up colonoscopies, .
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