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Table 3 Logistic analysis of factors for a poor bowel preparation (Ottawa score ≥ 6)

From: A randomized controlled trial of an educational video to improve quality of bowel preparation for colonoscopy

  Univariate analysis
Factor OR 95 % CI P value
Age 0.99 0.96–1.02 0.989
Sex
 Male 2.14 1.11–4.13 0.024
 Female 1 (Reference)
BMI 1.02 0.94–1.1 0.724
Previous colonoscopy 0.79 0.60–1.03 0.786
Abdominal operation history 0.89 0.37–2.17 0.809
Diabetes mellitus 3.01 1.19–7.60 0.020
Educational level
  < Middle school 1 (Reference)
 Middle school 1.7 0.11–26.14 0.703
 High school 0.94 0.16–5.68 0.949
 Graduate 1.75 0.68–4.52 0.250
 Postgraduates 0.92 0.36–2.33 0.860
Annual income level, $
  < 10.000 1 (Reference)
 10,000–20,000 0.71 0.06–7.81 0.777
  > 20,000–30,000 0.97 0.23–4.06 0.963
  > 30,000–40,000 0.45 0.17–1.18 0.103
  > 40,000 0.81 0.39–1.67 0.572
Educational video
 Non-video group 3.06 1.73–5.42 <0.001
 Video group 1 (Reference)
Multivariate analysis
Sex
 Male 1.95 1.07–3.54 0.029
 Female 1 (Reference)  
Diabetes mellitus 2.79 1.16–6.70 0.021
Educational video
 Non-video group 3.09 1.77–5.39 <0.001
 Video group 1 (Reference)