Table 3

Colonoscopies categorised as false-negative* or true-positive† and PCCRC 3-year rates‡ stratified by presence of type 2 diabetes (T2D)

Colonoscopies¶PCCRC 3-year rate‡
False-negative colonoscopies*, nTrue-positive colonoscopies†, nTotal, n%
Patients with T2D250293831887.90
Sex
 Female113113412479.10
 Male137180619437.00
Age at colonoscopy
 0–59212573787.60
 60–69738349078.00
 70+156184720037.80
Year of colonoscopy
 1995–2001287510327.20
 2002–2008817888699.30
 2009–2015141207522166.40
Patients without T2D1,65820 59422 2527.40
Sex
 Female8449,81910 6637.90
 Male81410 77511 5897.00
Age at colonoscopy
 0–59259356538246.80
 60–69453597564287.00
 70+94611 05412 0007.90
Year of colonoscopy
 1995–20013821198158024.20
 2002–2008664650871729.20
 2009–201561212 88813 5004.50

  • Denmark, 1995–2015.

  • *Colonoscopies in which a CRC was diagnosed within >6 to 36 months after the procedure.

  • †Colonoscopies in which a CRC was detected within the following 6 months.

  • ‡False-negative colonoscopies/ (true-positive colonoscopies+false-negative colonoscopies) × 100.

  • §Diagnosis of T2D recorded in the Danish National Patient Registry before or within 90 days after the first false-negative or true-positive colonoscopy and/or at least one redeemed prescription for a glucose-lowering drug recorded in the Danish National Health Service Prescription Database before or within 90 days after the first false-negative or true-positive colonoscopy. Patients with diabetes diagnoses and prescriptions recorded before age 30 not included as these were considered to represent patients with type 1 diabetes.

  • ¶Each individual was allowed one or more colonoscopy; however, only the first false-negative and true-positive colonoscopies were included in these numbers and the calculated PCCRC 3-year rates.

  • CRC, colorectal cancer; PCCRC, postcolonoscopy colorectal cancer.