TABLE 5.
Study 2: Characteristics two patient cohorts (receiving open-access [OA] and non-OA colonoscopy in fiscal year 2006) matched according to propensity score
|
Colonoscopy
|
|||
|---|---|---|---|
| Patients | OA (n=29,767) | Non-OA (n=29,767) | OA (not matched) (n=12,209) |
| Age, years, median | |||
| <50 | 7775 (26) | 7775 (26) | 2128 (17) |
| 50–69 | 18,513 (62) | 18,513 (62) | 8676 (71) |
| ≥70 | 3479 (12) | 3479 (12) | 1405 (12) |
| Sex | |||
| Female | 15,559 (52) | 15,559 (52) | 6010 (49) |
| Male | 14,208 (48) | 14,208 (48) | 6199 (51) |
| Income quintile | |||
| Low | 3450 (12) | 3615 (12) | 1363 (11) |
| 2 | 4469 (15) | 4574 (15) | 1662 (14) |
| 3 | 5413 (18) | 5362 (18) | 2008 (16) |
| 4 | 7074 (24) | 7096 (24) | 2657 (22) |
| High | 9361 (32) | 9120 (31) | 4519 (37) |
| Comorbidities* (ADGs) | |||
| 0–3 | 10,695 (36) | 10,093 (34) | 6286 (51) |
| 4–5 | 9323 (31) | 9487 (32) | 3093 (25) |
| 6–7 | 5544 (19) | 5843 (20) | 1737 (14) |
| ≥8 | 4205 (14) | 4344 (15) | 1093 (9) |
| Physicians | |||
|
| |||
| Specialty | |||
| Gastroenterology | 15,465 (52) | 16,870 (57) | 5165 (42) |
| Surgery | 12,554 (42) | 11,285 (38) | 5538 (45) |
| Internal medicine | 1080 (4) | 925 (3) | 681 (6) |
| Other practitioner† | 668 (2) | 687 (2) | 825 (7) |
| Physician volume quintile‡ | |||
| Low | 5380 (18) | 4917 (17) | 2803 (23) |
| 2 | 4523 (15) | 4286 (14) | 2156 (18) |
| 3 | 4825 (16) | 4672 (16) | 1822 (15) |
| 4 | 5932 (20) | 6280 (21) | 1763 (14) |
| High | 9107 (31) | 9612 (32) | 3665 (30) |
| Institution | |||
|
| |||
| Type | |||
| Academic | 4899 (17) | 5177 (17) | 2318 (19) |
| Community | 12,193 (41) | 12,211 (41) | 1961 (16) |
| Nonhospital | 12,675 (43) | 12,379 (42) | 7930 (65) |
Data presented as n (%).
*
Comorbidity scored using number of aggregated diagnosis groups (ADGs) using the Johns Hopkins Case-Mix System;
†
Other practitioners comprise all other specialties including family physicians and general practitioners;
‡
Mean annual number of colonoscopies (using the average annual number of colonoscopies performed by the physician in the five years before the colonoscopy)