Table 3:
Positive predictive values of OHIP definition of colonoscopy, nonhospital setting, colonoscopy completeness, anesthesiologist assistance and polypectomy compared to reference standards
| OHIP definition | PPV (95% CI) |
|---|---|
| Colonoscopy case | |
| 1. Z555A ± other E codes | 96.4 (95.2–97.6) |
| 2. Z555A + E740A ± other E codes | 97.7 (96.6–98.8) |
| 3. Z555A + E740A + E741A ± other E codes | 99.1 (98.0–100) |
| 4. Z555A + E740A + E741A + E747A ± other E codes | 99.1 (98.1–100) |
| 5. Z555A + E740A + E741A + E747A + E705A | 98.3 (96.0–100) |
| 6. Z555A + E741A ± other E codes | 99.1 (98.1–100) |
| 7. Z555A + E747A ± other E codes | 99.2 (98.1–100) |
| 8. Z555A + E705A ± other E codes | 98.3 (96.0–100) |
| 9. Z555A + E740A + E747A ± other E codes | 99.1 (98.1–100) |
| 10. Z555A + E740A + E705A ± other E codes | 98.3 (96.0–100) |
| 11. Z555A + E741A + E747A ± other E codes | 99.2 (98.1–100) |
| 12. Z555A + E741A + E705A ± other E codes | 98.3 (96.0–100) |
| 13. Z555A + E747A + E705A ± other E codes | 98.3 (96.0–100) |
| 14. Z555A + 1 or more of E740A, E741A, E747A or E705A | 97.7 (96.6–98.8) |
| Nonhospital setting | |
| 1. E649A billed on date of colonoscopy | 100 (100–100) |
| 2. No record in CIHI database overlapping with date of colonoscopy according to OHIP database | 100 (100–100) |
| 3. E649A and no overlapping record in CIHI database | 100 (100–100) |
| Colonoscopy completeness, defined using most sensitive colonoscopy definition | |
| 1. Weighted analysis results | 99.0 (98.3–99.7) |
| 2. Unweighted analysis results | 99.0 (98.3–99.7) |
| Colonoscopy completeness, defined using most accurate colonoscopy definition | |
| 1. Weighted analysis results | 99.0 (98.3–99.7) |
| 2. Unweighted analysis results | 99.0 (98.3–99.7) |
| Anesthesiologist assistance | |
| 1. v. “anesthesiologist’s record” | 83.8 (71.5–96.0) |
| 2. v. “use of propofol” | 77.2 (64.3–90.1) |
| Polypectomy | |
| v. “polyp seen or removed” | |
| 1. Z571A alone | 99.0 (97.7–100) |
| 2. Z571A, Z570A or E685A | 98.7 (97.3–100) |
| 3. Z571A, Z570A, E717A or E685A | 79.2 (74.3–84.2) |
| v. “histology” | |
| 1. Z571A alone | 68.1 (62.2–74.1) |
| 2. Z571A, Z570A or E685A | 64.1 (58.1–70.2) |
| 3. Z571A, Z570A, E717A or E685A | 49.7 (44.4–55.0) |
Note: CI = confidence interval, CIHI = Canadian Institute for Health Information, OHIP = Ontario Health Insurance Plan, PPV = positive predictive value.