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Table 1 Characteristics of cohort

From: Risk of inflammatory bowel disease following a diagnosis of irritable bowel syndrome

Variables Well-defined IBS cohort Other IBS cohort Non-IBS cohort
N 2,205 7,136 18,678
Mean (SD) age[1] 31.2 (7.8) 30.1 (8.0) 28.5 (7.9)
N (%) male 1281 (58.1) 3996 (56.0) 15014 (80.4)[2]
Race [N (%)]    
Black 394 (17.9) 1238 (17.4) 3397 (18.2)
White 1492 (67.7) 4792 (67.2) 11894 (63.7)
Other 319 (14.5) 1106 (15.5) 3387 (18.1)
Education level [N (%)][1]    
High school 1348 (61.1) 4514 (63.3) 12721 (68.1)
At least some college 568 (25.8) 1771 (24.8) 3772 (20.2)
Masters or doctorate 186 (8.4) 505 (7.1) 1182(6.3)
Unknown 103 (4.7) 346 (4.9) 1003 (5.4)
Service [N (%)][1]    
Army 736 (33.4) 2328 (32.6) 6137 (32.9)
Air Force 783 (35.5) 2476 (34.7) 6080 (32.6)
Navy 510 (23.1) 1649 (23.1) 4300 (23.0)
Marines 124 (5.6) 467 (6.5) 1573 (8.4)
Coast Guard 52 (2.4) 216 (3.0) 588 (3.2)
Rank [N (%)][1]    
Enlisted 1813 (82.2) 5935 (83.2) 15704 (84.1)
Officer/Warrant officer 392 (17.8) 1201 (16.8) 2974 (15.9)
Marital status [N (%)][1]    
Married 1358 (61.6) 4153 (58.2) 9740 (52.2)
Single 668 (30.3) 2514 (35.2) 8228 (44.1)
Other 174 (7.9) 461 (6.5) 680 (3.6)
Unknown 4 (0.2) 8 (0.1) 30 (0.2)
N (%) deployed during surveillance period 554 (25.1) 1878 (26.3) 2432 (26.0)
Primary outcomes    
N (%) with IBD 22 (1.0) 53 (0.7) 19 (0.1)
N (%) with UC 11 (0.5) 22 (0.3) 11 (0.06)
N (%) with CD 9 (0.4) 24 (0.3) 5 (0.03)
N (%) with IC 2 (0.09) 6 (0.08) 3 (0.02)
Mean (SD) years of follow-up 3.6 (2.7) 3.3 (2.7) 3.7 (2.8)
  1. [1] At start of follow-up period.
  2. [2] 2 subjects with missing data.