TABLE 4.
Estimated Prevalent Cases of Fistulizing CD Based on the US Claims Database Analysis
| Type | 2014 Prevalent Casesa,b | 2017 Prevalent Casesb |
|---|---|---|
| No. (95% CI) | No. (95% CI) | |
| Anal | 56,004 (54,398–57,610) | 57,359 (55,714–59,004) |
| Rectovaginal | 6064 (5656–6472) | 6211 (5793–6629) |
| Enterocutaneous | 3188 (2960–3416) | 3265 (3031–3499) |
| Internalc | 16,918 (16,303–17,533) | 17,327 (16,697–17,957) |
| Totald | 73,878 (72,203–75,553) | 75,666 (73,950–77,382) |
Rounded values displayed; calculations performed without restricting number of decimal places.
aBased on number of prevalent cases among active records as of December 31, 2014. bExtrapolated to US population based on projected population for corresponding year published by the US Census Bureau.12
cNo specific ICD-9 or surgical codes are available for enterocutaneous fistulas. Cases were estimated as an extrapolation from prior literature (please see Population-Based Database Analysis in the Methods section).
dSum of prevalent cases for different fistula types exceeds total prevalent cases due to patients with >1 type of fistula.