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Table 4 Miss rates per participants (number of participants with adenoma/hyperplastic polyp missed in first-pass examination 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 (n = 86)

CO2 group (n = 86)

P value

Any adenoma, n (%) [95% CI]

19 (22.1) [13.9, 32.3]

27 (31.4) [21.8, 42.3]

0.228

Diminutive (≤5 mm) adenoma, n (%) [95% CI]

15 (17.4) [10.1, 27.1]

25 (29.1) [19.8, 39.9]

0.104

Right colon adenoma, n (%) [95% CI]

10 (11.6) [5.7, 20.4]

19 (22.1) [13.9, 32.3]

0.102

Proximal colon adenoma, n (%) [95% CI]

12 (14.0) [7.4, 23.1]

24 (27.9) [18.8, 38.6]

0.038

Distal colon adenoma, n (%) [95% CI]

9 (10.5) [4.9, 18.9]

9 (10.5) [4.9, 18.9]

1.000

Right colon hyperplastic polyp, n (%) [95% CI]

1 (1.2) [0.03, 6.3]

7 (8.1) [3.3, 16.1]

0.064

Proximal colon hyperplastic polyp, n (%) [95% CI]

6 (7.0) [2.6, 14.6]

11 (12.8) [6.6, 21.7]

0.307

Right colon combined adenoma and hyperplastic polyp, n (%) [95% CI]

10 (11.6) [5.7, 20.4]

24 (27.9) [18.8, 38.6]

0.012

Proximal colon combined adenoma and hyperplastic polyp, n (%) [95% CI]

16 (18.6) [11.0, 28.5]

33 (38.4) [28.1, 49.5]

0.007

  1. Abbreviation: WE Water exchange, CI confidence interval