Table 2 Univariate analysis of factors associated with insertion time duringunsedated colonoscopy

Age (years)

  <65

518

7.4 ± 0.3

  ≥65

94

9.0 ± 0.6

0.020

Gender (male/female)

  Male

315

7.1 ± 0.3

  Female

297

8.2 ± 0.4

0.019

BMI (kg/m2)

  Underweight (<18.5)

68

10.8 ± 1.0

  Healthy weight (18.5-24.9)

383

7.3 ± 0.3

  Overweight (25.0-29.9)

145

7.2 ± 0.5

  Obesity (≥30)

16

6.4 ± 0.9

<0.001

Colonoscopists

  Senior(n = 9)

414

7.2 ± 0.3

  Junior(n = 9)

198

8.5 ± 0.4

0.004

Sleep quality

  Excellent or good

534

7.3 ± 0.2

  Fair or bad

78

9.7 ± 1.0

0.004

Interval time of appointment to colonoscopy (days)

  <10

348

8.0 ± 0.3

  ≥10

264

7.1 ± 0.3

0.065

Smoking

  Yes

126

7.0 ± 0.5

  No

486

7.7 ± 0.3

0.089