Table 3.
Association between healthcare system, patient characteristics, and receipt of colonoscopy 6 months to 3.5 years after high-risk findings, Kaiser Permanente Northern California, Southern California, and Washington
| Percentage with subsequent colonoscopy | Odds ratio | 95% confidence interval | |
|---|---|---|---|
| Index colonoscopy findings | |||
| 1–2 adenomas with ≥1 villous/tubulovillous adenoma | 45.7 (44.0, 47.5) | 1.00 | Reference |
| ≥3 adenomas, no villous/tubulovillous adenomas | 51.4 (48.9, 54.0) | 1.29 | (1.16, 1.44) |
| ≥3 adenomas with ≥1 villous/tubulovillous adenoma | 55.3 (50.8, 60.0) | 1.43 | (1.19, 1.71) |
| Health system | |||
| KPNC | 48.1 (46.1, 50.1) | 1.00 | Reference |
| KPSC | 47.0 (45.0, 49.1) | 0.89 | (0.80, 0.99) |
| KPWA | 59.5 (53.8, 65.2) | 1.41 | (1.14, 1.74) |
| Age at index colonoscopy (years) | |||
| 50–54 | 45.9 (42.6, 49.4) | 1.00 | Reference |
| 55–59 | 43.5 (40.1, 47.1) | 0.93 | (0.78, 1.11) |
| 60–64 | 53.1 (49.8, 56.4) | 1.27 | (1.08, 1.49) |
| 65–69 | 54.5 (51.2, 57.8) | 1.58 | (1.25, 2.00) |
| 70–74 | 51.2 (47.8, 54.6) | 1.28 | (1.00, 1.63) |
| 75–79 | 45.6 (41.3, 50.1) | 1.08 | (0.82, 1.41) |
| 80–89 | 24.2 (19.4, 29.9) | 0.36 | (0.26, 0.50) |
| Sex | |||
| Male | 48.5 (46.7, 50.3) | 1.00 | Reference |
| Female | 47.9 (45.8, 50.2) | 1.02 | (0.92, 1.13) |
| Race/ethnicity | |||
| Non-Hispanic White | 47.4 (45.7, 49.3) | 1.00 | Reference |
| Non-Hispanic Black | 50.3 (45.9, 54.8) | 1.17 | (0.99, 1.39) |
| Non-Hispanic Asian | 51.2 (46.7, 55.9) | 1.11 | (0.94, 1.32) |
| Hispanic | 49.3 (46.0, 52.8) | 1.16 | (1.01, 1.34) |
| Othera | 49.4 (39.8, 60.0) | 0.87 | (0.61, 1.26) |
| Missing | 39.6 (31.4, 49.0) | 0.46 | (0.34, 0.63) |
| Insurance | |||
| Medicare | 48.7 (46.8, 50.7) | 1.00 | Reference |
| Commercial/private | 48.0 (46.1, 50.1) | 1.06 | (0.87, 1.28) |
| Medicaid and other governmental | 39.1 (25.6, 56.6) | 1.20 | (0.60, 2.39) |
| Charlson comorbidity index score | |||
| 0 | 47.6 (45.5, 49.7) | 1.00 | Reference |
| 1 | 48.8 (45.7, 52.0) | 1.12 | (0.98, 1.28) |
| 2 | 49.0 (45.1, 53.1) | 1.04 | (0.89, 1.22) |
| 3+ | 47.1 (44.0, 50.3) | 1.04 | (0.90, 1.20) |
| Unknown | 55.9 (48.4, 63.8) | 1.76 | (1.37, 2.26) |
a
Other includes: American Indian / Alaska Native, Pacific Islander, and multiple races
Abbreviations: KPNC = Kaiser Permanente Northern California; KPSC = Kaiser Permanente Southern California; KPWA = Kaiser Permanente Washington