TABLE 3.
Estimated Incident Cases, Duration, and Prevalent Cases of Fistulizing CD in the United States
| Type | 2017 Incident Cases | Duration, ya | 2017 Prevalent Casesb |
|---|---|---|---|
| No. (95% CI) | No. (95% CI) | ||
| Anal | 8581 (1255–15,907) | 6.2 | 52,862 (7734–97,993) |
| Rectovaginal | 1430 (209–2651) | 5.1 | 7356 (1076–13,636) |
| Enterocutaneous | 894 (131–1657) | 2.5 | 2251 (329–4172) |
| Internal | 4827 (706–8948) | 2.9 | 14,147 (2070–26,225) |
| Total | 15,732 (2302–29,162) | – | 76,616 (11,209–142,026) |
Rounded values displayed; calculations performed without restricting number of decimal places.
aCalculated based on reported median duration of fistula episodes,6 categorical distribution of patients experiencing each quantity of episodes,2 and median time between episodes.2 Further details are provided in the Supplementary Data.
bCalculated as: incident cases * duration.