Table 2.
Demographics and disease characteristics by race
| Total population (n = 228)a | White (n = 105) | Black (n = 34) | Hispanic (n = 35) | Asian (n = 51) | P-value | |
|---|---|---|---|---|---|---|
| Percentage of study population | – | 46.1 | 14.9 | 15.4 | 22.4 | – |
| Proportion of each race in the overall healthcare system, 2007b | – | 25 | 20 | 30 | 20 | – |
| Proportion of each race in the overall San Francisco population, 2008c | – | 45.6 | 6.8 | 14.1 | 31.3 | – |
| Female, no. (%)d | 94 (41.2) | 42 (40.0) | 12 (35.3) | 16 (45.7) | 23 (45.1) | 0.76 |
| Current smoker, no. (%)d | 48 (21.1) | 25 (23.8) | 18 (52.9) | 2 (5.7) | 3 (4.8) | <0.001 |
| Mean age at diagnosis, years (SD)e | 34.0 (14.1) | 30.5 (11.8) | 31.7 (14.3) | 37.1 (16.0) | 41.0 (14.6) | <0.001 |
| Disease duration, years (SD)e | 7.9 (9.0) | 8.6 (9.4) | 12.1 (13.0) | 5.2 (5.5) | 5.4 (5.4) | 0.003 |
| Family history of IBD, no. (%)d | 37 (16.2) | 27 (25.7) | 3 (8.8) | 4 (11.4) | 3 (5.9) | 0.01 |
| Diagnosis, no. (%)d, f | 0.11 | |||||
| Crohn’s disease | 77 (33.4) | 37 (35.2) | 17 (50.0) | 10 (28.6) | 13 (25.5) | |
| Ulcerative colitis | 150 (65.8) | 68 (64.8) | 16 (47.1) | 25 (71.4) | 38 (74.5) | |
| Inflammatory bowel disease, type unclassified | 1 (0.4) | 0 (0.0) | 1 (2.9) | 0 (0.0) | 0 (0.0) |
aIncludes three patients with “other” race
bData from [15]
cData from [18]
d P-value calculated using contingency tables and Pearson’s χ2 or Fisher’s exact test, as appropriate
e P-value calculated using analysis of variance (ANOVA)
fComparing patients with Crohn’s disease (CD) and ulcerative colitis (UC); excludes patients with inflammatory bowel disease type unclassified (IBDU)