Table 1.
Demographic characteristics of study subjects.
| IBS | Control | IBS vs. Control, P-value | IBS diagnosed by GI* | IBS diagnosed by non-GI* | IBS diagnosed by GI vs. non-GI, P-value | ||
|---|---|---|---|---|---|---|---|
| N=141,295 | N=141,294 | N=14,640 | N=102,187 | ||||
| Mean Age (SD) in 2007, years | 53.0 (17.4) | 53.0 (17.4) | NA | 55.9 (16.0) | 53.0 (17.5) | NA | |
| Gender | Women | 104,047 (73.6%) | 104,037 (73.6%) | NA | 11,184 (76.4%) | 74,552 (73.0%) | NA |
| Men | 37,237 (26.4%) | 37,247 (26.4%) ^ | NA | 3,455 (23.6%) | 27,626 (27.0%) | NA | |
| Race and Ethnicity | Caucasian | 74,635 (52.8%) | 60,882 (43.1%) | <0.0001 | 8,592 (58.7%) | 53,383 (52.2%) | <0.0001 |
| African American | 7,861 (5.6%) | 8,405 (5.9%) | 1,140 (7.8%) | 5,526 (5.4%) | |||
| Asian | 8,896 (6.3%) | 12,471 (8.8%) | 857 (5.9%) | 6,730 (6.6%) | |||
| Hispanic or Latino | 11,668 (8.3%) | 9,904 (7.0%) | 1,159 (7.9%) | 8,542 (8.4%) | |||
| Native American | 732 (0.5%) | 557 (0.4%) | 99 (0.7%) | 507 (0.5%) | |||
| Mixed | 4,973 (3.5%) | 3,927 (2.8%) | 586 (4.0%) | 3,532 (3.5%) | |||
| Other | 533 (0.4%) | 660 (0.5%) | 61 (0.4%) | 398 (0.4%) | |||
| Unknown | 31,997 (22.6%) | 44,488 (31.5%) | 2,146 (14.7%) | 23,569 (23.1%) | |||
| Mean coverage period (SD), years | 8.0 (3.4) | 8.0 (3.4) | NA | 8.5 (3.2) | 8.0 (3.4) | NA | |
| Mean coverage period before IBS diagnosis coded (SD), years | 4.1 (3.2) | NA | 4.5 (3.1) | 4.4 (3.2) | |||
| Mean coverage period after IBS diagnosis coded (SD), years | 4.7 (3.3) | NA | 4.7 (3.2) | 4.4 (3.1) |
IBS: Irritable bowel syndrome; GI: gastroenterologist; SD: Standard deviation; NA: Not applicable
*
Provider specialty known for 83% of IBS patients