Table 2.

Predictive factors for quality of bowel preparation independent of colon cleansing agent [8, 11, 15]

Patient-related factors

Age > 65 years

Male sex

History of prior inadequate preparation

Prior colon resection

Comorbidities

Diabetes

Chronic constipation

Stroke disease

Dementia

Low activation

Constipating drugs, e.g. opioids, psycho-pharmaca

Inpatient status

Low socioeconomic status

Procedure-related factors

Timing of purgative administration

Appointment waiting times

Adherence to bowel preparation instructions

Ingestion of <90% of the preparation