Table 3.
Cumulative relapse rate at 1 and 5 years for patients presenting with their first episode of ulcerative colitis
| Source | Country of study | Subjects | Cumulative relapse rate, % | |||
|---|---|---|---|---|---|---|
| Study period | Age, y | Current smoker, % (n/N) | 1 y | 5 y | ||
| Moum et al, 199716 | Norway | 1990–1993 | NA | 14 | 50 | NA |
| Höie et al, 200718 | 7 European countries, Israel | 1991–1993 | NA | 12.6 (97/771) | 28a | 58a |
| Romberg-Camps et al, 200923 | Netherlands | 1991–2003 | Mean = 42.0 | NA | 44 | NA |
| Vester-Andersen et al, 201424 | Denmark | 2003–2004 | Median = 37.3 (IQR = 1.5–93.5) | 15 (45/300) | 51 | 75 |
| Kitano et al, 201125 | Japan | 1970–2011 | Mean = 28.5 (SD = 38.5) | NA | 68.1 | NA |
| Chiba et al, 2018b10 | Japan | 2003–2016 | Median = 34 (IQR = 22–51) | NA | 4 | 17 |
| Present study | Japan | 2003–2017 | Median = 35 (IQR = 22–56) | 18 (9/51) | 14 | 27 |
a
Estimated from a Kaplan-Meier plot.
b
Cases of educational hospitalization provided a plant-based diet.
IQR = interquartile range; NA = not available; SD = standard deviation.