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. Author manuscript; available in PMC: 2021 Dec 1.
Published in final edited form as: Clin Gastroenterol Hepatol. 2020 Feb 1;18(13):2937–2944.e1. doi: 10.1016/j.cgh.2020.01.037

Table 3.

Prevented CRC Cases and Percentage Reduction due to Adenoma Removal Subsequent to the Baseline colonoscopy

Baseline Adenoma Group
Advanced
Adenoma
(AA)		 3+ Non-
advanced
adenomas
(NAA3+)		 1-2 Non-
advanced
adenomas
(NAA1-2)		 Any adenoma
(AA, NAA3+,
NAA1-2)		 No adenoma
(N)
Person Years of CRC incidence follow-up 26540 5263 41772 73575 73846
# (rate per 10,000 PY) # (rate per 10,000 PY) # (rate per 10,000 PY) # (rate per 10,000 PY) # (rate per 10,000 PY)
Observed number of
CRC cases (rate per 10,000 PY)		 56 (21.1) 4 (7.9) 33 (7.9) 93 (12.6) 48 (6.5)
Number of prevented cases (rate per 10,000 PY) 1 18.7 (7.1) 4.8 (9.5) 17.3 (4.1) 40.9 (5.6) 16.1 (2.2)
Percentage Incidence Reduction (95% CI) 2 25.0 (16-34) ** 34.4 (21-48) 30.5 (22-39) 25.1(13-39)
1.

Cases prevented were derived by dividing total dwell time avoided (Table 2) by the estimate of DTA (dwell time avoided per CRC case prevented) of 612 years.

2.

Percentage incidence reduction equals 100*( Cp/(CP+CO) ) where CO is observed cases and CP is prevented cases.

**

- Number of cases too small to reliably calculate