Table 4.
Characteristics of patients who underwent a second or third surveillance colonoscopy within two years of a previous normal colonoscopy. ****
| Patients with normal first colonoscopy | Patients normal second colonoscopy | ||||||
|---|---|---|---|---|---|---|---|
| Characteristics | Category | N | Received 2nd surveillance colonoscopy* within 2 years after 1st normal colonoscopy |
p-value | N | Received 3rd Surveillance colonoscopy* within 2 years after 2nd normal colonoscopy |
p-value |
| Overall | 14144**** | 32.1 | 8047**** | 27.3 | |||
| Age (years) | 67 – 69 | 1755 | 45.0 | <0.0001 | 546 | 46.3 | <0.0001 |
| 70 – 74 | 3775 | 36.2 | 2314 | 30.9 | |||
| 75 – 79 | 4045 | 32.3 | 2515 | 27.7 | |||
| ≥ 80 | 4569 | 23.6 | 2672 | 20.0 | |||
| Gender | Male | 5957 | 34.2 | <0.0001 | 3457 | 28.7 | 0.0146 |
| Female | 8187 | 30.6 | 4590 | 26.3 | |||
| Ethnicity | White | 12352 | 32.1 | 0.3008 | 7046 | 27.2 | 0.3411 |
| Black | 819 | 33.9 | 418 | 29.0 | |||
| Hispanic | 435 | 32.2 | 252 | 31.0 | |||
| Other | 538 | 29.0 | 331 | 24.8 | |||
| SEER Regions | Connecticut | 1383 | 31.0 | <0.0001 | 821 | 21.7 | <0.0001 |
| Detroit | 1801 | 42.3 | 1254 | 35.9 | |||
| Hawaii | 214 | 26.2 | 131 | 19.9 | |||
| Iowa | 2408 | 35.1 | 1567 | 28.8 | |||
| New Mexico | 343 | 46.7 | 241 | 38.2 | |||
| Seattle | 938 | 16.4 | 532 | 13.5 | |||
| Utah | 425 | 33.7 | 238 | 28.2 | |||
| Atlanta/Rural Georgia | 608 | 28.1 | 347 | 22.2 | |||
| Kentucky | 784 | 25.3 | 307 | 27.0 | |||
| Louisiana | 619 | 30.4 | 242 | 28.9 | |||
| New Jersey | 1301 | 39.1 | 584 | 34.9 | |||
| California | 3320 | 28.0 | 1783 | 24.0 | |||
| Marital Status | Married | 8090 | 34.1 | <0.0001 | 4856 | 28.5 | 0.0026 |
| Not Married | 6054 | 29.5 | 3191 | 25.5 | |||
| Census Track education (% adult less than 12 years education) |
< 9.1% | 3398 | 30.1 | 0.0012 | 1932 | 25.5 | 0.0023 |
| 9.1 – < 15.3% | 3436 | 31.1 | 1984 | 25.4 | |||
| 15.3 – < 23.4% | 3514 | 34.4 | 2029 | 28.3 | |||
| ≥ 23.4% | 3625 | 32.9 | 1978 | 30.2 | |||
| Census Track below poverty |
< 4.1% | 3178 | 35.2 | 0.0001 | 1931 | 28.5 | 0.6407 |
| 4.1 – < 7.7% | 3417 | 32.3 | 1962 | 26.8 | |||
| 7.7 – < 15.1% | 3578 | 30.0 | 2057 | 26.5 | |||
| ≥ 15.1% | 3800 | 31.6 | 1973 | 27.6 | |||
| Comorbidity | 0 | 10810 | 28.9 | <0.0001 | 5617 | 27.3 | 0.0919 |
| 1 | 2092 | 43.3 | 1621 | 28.9 | |||
| 2 | 743 | 43.5 | 506 | 25.5 | |||
| ≥3 | 499 | 37.3 | 303 | 22.4 | |||
| Year of diagnosis |
1992 | 988 | 37.7 | <0.0001 | 719 | 32.1 | <0.0001 |
| 1993 | 870 | 39.3 | 646 | 30.0 | |||
| 1994 | 876 | 35.8 | 642 | 30.5 | |||
| 1995 | 853 | 39.0 | 629 | 25.9 | |||
| 1996 | 839 | 33.6 | 689 | 27.1 | |||
| 1997 | 880 | 30.1 | 681 | 23.9 | |||
| 1998 | 940 | 33.1 | 706 | 23.4 | |||
| 1999 | 887 | 27.5 | 578 | 20.4 | |||
| 2000 | 1913 | 29.3 | 1251 | 23.8 | |||
| 2001 | 1860 | 30.1 | 925 | 27.8 | |||
| 2002 | 1781 | 28.4 | 581 | 39.1 | |||
| 2003 | 1457 | 31.2 | |||||
| AJCC stage | 1 | 4762 | 30.4 | 0.0004 | 2838 | 27.0 | 0.0297 |
| 2 | 5587 | 31.9 | 3147 | 26.3 | |||
| 3 | 3741 | 34.5 | 2035 | 29.5 | |||
| Grade | Well | 1361 | 31.5 | 0.7045 | 765 | 25.1 | 0.1824 |
| Moderate | 9735 | 32.0 | 5528 | 27.9 | |||
| Poor/Unknown | 2283 | 32.8 | 1284 | 26.3 | |||
| Physician specialty** |
Gastroenterology | 6542 | 29.8 | <0.0001 | 3748 | 25.5 | 0.0041 |
| Generalist | 987 | 32.9 | 594 | 26.1 | |||
| Surgeon | 5703 | 34.7 | 3134 | 29.3 | |||
| Other | 317 | 31.3 | 187 | 27.3 | |||
| Years since graduation of the colonoscopist *** |
< 10 | 536 | 41.8 | <0.0001 | 369 | 30.4 | 0.5395 |
| 10 – 19 | 3921 | 34.0 | 2450 | 26.9 | |||
| 20 – 29 | 4658 | 30.6 | 2625 | 26.8 | |||
| >=30 | 2731 | 30.4 | 1346 | 27.1 | |||
Surveillance colonoscopy is defined as a colonoscopy with no diagnosis or prior procedure suggesting it was done for diagnostic reasons. Among all the patients who underwent a colonoscopy within 2 years after the first and second any colonoscopy diagnostic indication was found in 21% and 23% patients, respectively.
Data on physician specialty was missing for 595 patients (4.2%) and 384 patients (4.8%) for 1st and 2nd colonoscopy, respectively.
Data on year of graduation was missing for 2298 patients (16.3%) and 1257 patients (15.6%) for 1st and 2nd colonoscopy, respectively. Specialty and experience were all characteristics of the previous colonoscopy; for example in the analysis of early second surveillance colonoscopy, these are the characteristics related to first colonoscopy.
These analyses are limited to patients with a normal colonoscopy, with at least two years of follow-up data after that colonoscopy, to assess receipt of early subsequent surveillance colonoscopy. Surveillance colonoscopy is a colonoscopy lacking a diagnosis indicating it might be done to evaluate a specific symptom.