Characteristics at diagnosis of the five consecutive chronological cohorts of patients seen in our unit within the three months following diagnosis (group 1)
| Cohort 1978–82 | Cohort 1983–87 | Cohort 1988–92 | Cohort 1993–97 | Cohort 1998–2003 | |
|---|---|---|---|---|---|
| Numbers in parentheses are percentages. | |||||
| Intergroup comparisons showed no significant differences. | |||||
| Patients (n) | 34 | 46 | 102 | 176 | 207 |
| Males | 15 (44) | 24 (52) | 38 (37) | 71 (40) | 73 (35) |
| Median age (interquartile range) | 25 (21–35) | 27 (21–38) | 27 (20–37) | 29 (22–38) | 27 (20–36) |
| Disease location | |||||
| Ileocolonic | 13 (38) | 19 (41) | 41 (40) | 60 (34) | 72 (35) |
| Small bowel | 11 (32) | 16 (35) | 32 (31) | 59 (34) | 70 (34) |
| Colon | 7 (21) | 10 (22) | 27 (26) | 52 (30) | 60 (29) |
| Other | 3 (9) | 1 (2) | 2 (2) | 5 (3) | 5 (2) |
| Appendectomised | 13 (38) | 20 (43) | 35 (34) | 49 (28) | 63 (30) |
| Familial history | 4 (12) | 13 (28) | 10 (10) | 30 (17) | 33 (16) |
| Smokers | 18 (53) | 31 (67) | 51 (50) | 86 (49) | 100 (48) |
| Caucasian | 30 (88) | 40 (87) | 93 (91) | 153 (87) | 167 (81) |
| North-African non-Jewish ancestry | 2 (6) | 6 (13) | 8 (8) | 16 (9) | 26 (13) |
| Living outside Paris area | 13 (38) | 19 (41) | 26 (25) | 57 (32) | 65 (31) |