Table 1. Distribution of flexible endoscope models between the sprayed group and control group

All flexible endoscopes were from Olympus.

Table 2. Overall growth detected between the sprayed and control group

Values are presented as number (%) unless otherwise indicated. Percentage was calculated based on (1) no. of positive growth/no. of endoscope and (2) no. of any growth/no. of endoscope of the particular type of endoscope.

CI, confidence interval.

a)

Colony forming unit (cfu) equal to or more than 10 or the identification of any critical microorganisms,

b)

more than 0 cfu,

c)

0 cfu.

Table 3. Analysis of positive growth and any growth based on the total samples collected from gastroscopes, colonoscopes, and duodenoscopes

Values are presented as number (%). Percentage was calculated based on (1) no. of positive growth/number of endoscope and (2) no. of any growth/no. of endoscope of the particular type of endoscope. Analysis through: Free Statistic Calculators ver. 4.0 (https://www.danielsoper.com/statcalc/calculator.aspx?id=58).

a)

Colony forming unit (cfu) equal to or more than 10 or the identification of any critical microorganisms,

b)

more than 0 colony forming unit.

Table 4. Relationship between sprayed hours and microorganisms detected in colony forming unit

cfu, colony forming unit; IQR, interquartile range.

p-value calculated as unequal variance.

Table 5. Positive growtha) (n=4) obtained from colonoscopes with identified microorganisms

All flexible endoscopes were from Olympus. Colonoscope 1 was from control group and the rest of colonoscopes were from sprayed group.

a)

Colony forming unit (cfu) equal to or more than 10 or the identification of any critical microorganisms.

b)

There was no positive growth from both gastroscopes and duodenoscopes.