Table 1.
Demographics of Crohn’s disease patients in China and the United States recruited 2014-2016
| China (n = 49) | United States (n = 145) | P value | |
| Age at clinical diagnosis (yr) | 26.6 (13.1-46.7) | 25.9 (5.1-73.1) | 0.87 |
| Age at survey completion (yr) | 29.5 (19.2-49.9) | 43.4 (18.3-82.7) | < 0.0001 |
| Duration of disease at time of survey (yr) | 2.2 (0.0-12.7) | 12.4 (0.0-55.4) | < 0.0001 |
| Calendar year of diagnosis | 2013 (2003-2015) | 2003 (1960-2015) | < 0.0001 |
| Before 1969 | 0 | 1.4% | |
| 1970-1979 | 0 | 6.2% | |
| 1980-1989 | 0 | 9.7% | |
| 1990-1999 | 0 | 25.5% | |
| 2000-2009 | 12.2% | 30.3% | |
| 2010-2015 | 87.8% | 26.9% | |
| Female (%) | 42.9% | 58.6% | 0.06 |
| Smoking status at diagnosis (%) | 0.5 | ||
| Current smoker | 12.2% | 16.5%1 | |
| Former smoker | 6.1% (n = 3) | 10.8% | |
| Never smoker | 81.6% | 72.7% | |
| Number of siblings | 2 (0-7) | 2 (0-9) | 0.2 |
| 0 | 8.2% (n = 4) | 6.9% | |
| 1 | 12.2% | 29.7% | |
| 2 | 44.9% | 30.3% | |
| 3 | 12.2% | 18.6% | |
| 4+ | 22.5% | 14.5% | |
| Number of children | 0 (0-3) | 0 (0-7) | 0.81 |
| 0 | 53.1% | 51.0% | |
| 1 | 26.5% | 15.9% | |
| 2 | 18.4% | 22.8% | |
| 3 | 2.0% (n = 1) | 9.0% | |
| 4+ | 0 | 1.3% |
1
Six participants recruited in the United States did not report smoking status at diagnosis.