Relative risk of inadequate sigmoidoscopy by patient and examination characteristics, with and without adjustment for examination limitations
| Characteristic | Proportion with inadequate sigmoidoscopy (%) | Not limitations adjusted | Limitations adjusted | ||
|---|---|---|---|---|---|
| RR* | 95% CI | RR* | 95% CI | ||
| CI, confidence interval; RR, relative risk. | |||||
| *Adjusted for all other variables in table, with or without adjustment for examination limitations. | |||||
| †Colorectal cancer (CRC) in one first degree relative diagnosed at age 55 years or older. | |||||
| Age (y) | |||||
| 50–59 | 8.1 | 1.0 | Ref. | 1.0 | Ref. |
| 60–69 | 10.3 | 1.2 | 1.2–1.3 | 1.2 | 1.1–1.2 |
| 70–79 | 14.6 | 1.7 | 1.6–1.8 | 1.5 | 1.4–1.6 |
| 80+ | 22.0 | 2.6 | 2.3–3.0 | 1.8 | 1.6–2.1 |
| Sex | |||||
| Male | 6.1 | 1.0 | Ref. | 1.0 | Ref. |
| Female | 14.6 | 2.3 | 2.2–2.5 | 1.6 | 1.6–1.7 |
| Endoscopist specialty | |||||
| Gastroenterologist | 7.8 | 1.0 | Ref. | 1.0 | Ref. |
| Non-gastroenterologist MD | 10.0 | 1.3 | 1.2–1.4 | 1.2 | 1.2–1.3 |
| Nurse | 7.9 | 1.0 | 0.9–1.0 | 1.0 | 0.9–1.1 |
| Unknown | 26.5 | 3.3 | 3.0–3.5 | 2.1 | 1.9–2.3 |
| Family history of CRC† | |||||
| No | 10.2 | 1.0 | Ref. | 1.0 | Ref. |
| Yes | 9.4 | 0.9 | 0.8–1.0 | 0.9 | 0.8–1.0 |
| History of prior sigmoidoscopy | |||||
| No | 9.7 | 1.0 | Ref. | 1.0 | Ref. |
| Yes | 11.2 | 1.1 | 1.0–1.2 | 1.0 | 1.0–1.1 |
| Examination limited by | |||||
| Spasm/pain | |||||
| No | 5.6 | – | – | 1.0 | Ref. |
| Yes | 30.8 | – | – | 3.1 | 2.9–3.3 |
| Stool | |||||
| No | 8.6 | – | – | 1.0 | Ref. |
| Yes | 18.8 | – | – | 2.9 | 2.7–3.0 |
| Angulation | |||||
| No | 6.1 | – | – | 1.0 | Ref. |
| Yes | 34.1 | – | – | 2.9 | 2.8–3.1 |