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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