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Table 2 Risk factors associated with poor bowel preparation on univariate and multivariate analyses

From: Appointment waiting times and education level influence the quality of bowel preparation in adult patients undergoing colonoscopy

Patient characteristics

Quality of bowel preparation, n (%)

Unadjusted OR

95% CI

p

value

Adjusted OR

95% CI

p

value

 

Poor

n = 151

Non-poor

n = 350

      

Age

        

   < 65 years

80 (25.7)

231 (74.3)

1.00

     

   ≥ 65 years

71 (37.4)

119 (62.6)

1.74

1.19, 2.56

0.005

1.36

0.87, 2.10

0.17

Gender

        

   Female

69 (21.2)

176 (71.8)

1.00

  

-

-

-

   Male

82 (32.0)

174 (68.0)

1.20

0.82, 1.76

0.346

   

Education level

        

   ≥ Secondary

62 (20.5)

241 (79.5)

1.00

  

1.00

  

   ≤Primary

89 (44.4)

109 (55.6)

3.10

2.09, 4.61

< 0.001

2.35

1.54,3.60

< 0.001

Status

        

   Out-patient

90 (25.4)

264 (74.6)

1.00

  

1.00

  

   In-patient

61 (41.5)

86 (58.5)

2.08

1.39, 3.12

< 0.001

1.09

0.66, 1.81

0.73

Timing of colonoscopy

        

   Morning

132 (31.4)

289 (68.6)

1.00

  

1.00

  

   Evening

19 (23.7)

61 (76.7)

0.68

0.39, 1.19

0.176

0.70

0.37, 1.32

0.70

Appointment waiting time (weeks)

        

   < 1

23 (21.3)

85 (78.7)

1.00

  

1.00

  

   2 - 15

47 (31.8)

101 (68.2)

1.72

0.97, 3.06

0.065

1.52

0.81, 2.87

0.19

   > 16

81 (33.1)

164 (66.9)

1.83

1.07, 3.11

0.027

1.86

1.04, 3.37

0.035

BMI

        

   ≥ 23

82 (30.8)

184 (69.2)

1.00

  

-

-

-

   < 23

68 (29,4)

163 (70.6)

0.94

0.64, 1.38

0.736

   

Medical illness

        

   No

73 (27.2)

195 (72.8)

1.00

  

1.00

  

   Yes

75 (32.6)

155 (67.4)

1.29

0.88, 1.90

0.192

1.05

0.67, 1.62

0.84

Previous surgery

        

   No

101 (28.0)

260 (72.0)

1.00

  

1.00

  

   Yes

49 (35.5)

89 (64.5)

1.42

0.93, 2.15

0.101

1.17

0.73, 1.89

0.51

Previous colonoscopy

        

   No

102 (30.2)

236 (69.8)

1.00

  

-

-

-

   Yes

48 (29.8)

113 (70.2)

0.98

0.65, 1.48

0.934

   

Compliant to bowel preparation

        

   Yes

80 (20.9)

303 (79.1)

1.00

  

1.00

  

   No

71 (60.2)

47 (39.8)

5.72

3.67, 8.91

< 0.0001

4.76

3.0, 7.55

< 0.001