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Table 5 Miss rates per adenoma/polyp (number of adenomas/hyperplastic polyps missed in first colonoscopy as indicated by column head)

From: Water exchange colonoscopy decreased adenoma miss rates compared with literature data and local data with CO2 insufflation: an observational study

Miss rate WE group CO2 group P value
Overall AMR, n/N (%) [95% CI] 23/122 (18.9) [12.3, 26.9] 46/163 (28.2) [21.5, 35.8] 0.071
Size category, n/N (%) [95% CI]    0.069
 ≤5 mm 18/94 (19.1) [11.8, 28.6] 35/128 (27.3) [19.8, 35.9] 0.202
 6–9 mm 4/24 (16.7) [4.7, 37.4] 9/28 (32.1) [15.9, 52.4] 0.336
 ≥10 mm 1/4 (25.0) [0.6, 80.6] 2/7 (28.6) [3.7, 71.0] 1.000
Right colon AMR, n/N (%) [95% CI] 11/63 (17.5) [9.1, 29.1] 25/74 (33.8) [23.2, 45.7] 0.034
Size category, n/N (%) [95% CI]    0.022
 ≤5 mm 9/50 (18.0) [8.6, 31.4] 20/65 (30.8) [19.9, 43.5] 0.134
 6-9mm 2/12 (16.7) [2.1, 48.4] 4/6 (66.7) [22.3, 95.7] 0.107
 ≥10 mm 0/1 (0.0) [0.0, 97.5] 1/3 (33.3) [0.8, 90.6] 1.000
Right colon HPMR, n/N (%) [95% CI] 1/25 (4.0) [0.1, 20.4] 9/31 (29.0) [14.2, 48.0] 0.031
Right colon combined AMR and HPMR, n/N (%) [95% CI] 12/88 (13.6) [7.3, 22.6] 34/105 (32.4) [23.6, 42.2] 0.002
Proximal colon AMR, n/N (%) [95% CI] 13/84 (15.5) [8.5, 25.0] 34/112 (30.4) [22.0, 39.8] 0.018
Size category, n (%) [95% CI]    0.019
 ≤5 mm 11/68 (16.2) [8.4, 27.1] 27/92 (29.3) [20.3, 39.8] 0.062
 6–9 mm 2/15 (13.3) [1.7, 40.5] 5/16 (31.3) [11.0, 58.7] 0.394
 ≥10 mm 0/1 (0.0) [0.0, 97.5] 2/4 (50.0) [6.8, 93.2] 1.000
Proximal colon HPMR, n/N (%) [95% CI] 7/48 (14.6) [6.1, 27.8] 13/42 (31.0) [17.6, 47.1] 0.078
Proximal colon combined AMR and HPMR, n/N (%) [95% CI] 20/132 (15.2) [9.5, 22.4] 47/154 (30.5) [23.4, 38.4] 0.003
Distal colon AMR, n/N (%) [95% CI] 10/38 (26.3) [13.4, 43.1] 12/51 (23.5) [12.8, 37.5] 0.807
  1. Abbreviation: WE Water exchange, AMR adenoma miss rate, CI confidence interval, HPMR hyperplastic polyp miss rate