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Table 2 Colonoscopy procedural data

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

Variable WE group (n = 86) CO2 group (n = 86) P value
First-pass insertion time, mean (SD), minutes 8.65 (3.01) 6.18 (4.59) < 0.0001
First-pass withdrawal time, mean (SD), minutes 17.85 (7.71) 21.00 (7.50) 0.007
First-pass total procedure time, mean (SD), minutes 26.51 (8.52) 27.18 (8.56) 0.605
Second-pass insertion time, mean (SD), minutes 3.33 (1.66) 3.92 (2.42) 0.062
Second-pass withdrawal time, mean (SD), minutes 9.06 (2.91) 10.44 (3.37) 0.005
Second-pass total procedure time, mean (SD), minutes 12.39 (3.43) 14.36 (4.38) 0.001
Boston Bowel Preparation Scale scorea, mean (SD) 7.4 (0.7) 7.0 (0.5) < 0.0001
Water infused during insertiona, mean (SD), mL 1513.8 (510.5) 43.0 (79.7) < 0.0001
Water aspirated during insertiona, mean (SD), mL 1341.3 (437.0) 122.7 (108.8) < 0.0001
Aspirated as percent of infused during insertiona, mean (SD), % 89.3 (9.5) NA NA
Water infused during withdrawala, mean (SD), mL 261.5 (387.1) 587.9 (341.0) < 0.0001
Water aspirated during withdrawala, mean (SD), mL 358.2 (332.8) 556.0 (297.9) < 0.0001
Need for position changea, n (%) 48 (55.8) 45 (52.3) 0.760
Need for abdominal compressiona, n (%) 52 (60.5) 74 (86.0) 0.0002
In patients undergoing colonoscopy only, n (%) 57 (66.3) 53 (61.6) 0.634
 Fentanyl dose during first-pass examination, mean (SD), ug 73.9 (16.9) 72.4 (13.6) 0.610
 Midazolam dose during first-pass examination, mean (SD), mg 4.25 (1.13) 4.53 (1.14) 0.209
 Total fentanyl dose during first- and second-pass examinations, mean (SD), ug 82.5 (17.1) 79.3 (16.5) 0.335
 Total midazolam dose during first- and second-pass examinations, mean (SD), mg 4.69 (1.11) 4.89 (1.23) 0.388
  1. a Data were referred to first-pass examination only
  2. Abbreviation: WE Water exchange, SD standard deviation, NA not applicable