COVID-19 studies are our top priority. For all other trials, there is a 4-week delay in processing a trial submitted to the ANZCTR and additional delays for updates of registered trials. We appreciate your patience.

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been endorsed by the ANZCTR. Before participating in a study, talk to your health care provider and refer to this information for consumers
Trial registered on ANZCTR

Registration number
Ethics application status
Date submitted
Date registered
Date last updated
Date data sharing statement initially provided
Date results information initially provided
Type of registration
Retrospectively registered

Titles & IDs
Public title
Influence of a behavioural incentive and intensive education on the quality of bowel preparation prior to diagnostic colonoscopies
Scientific title
Influence of a behavioural incentive (reward) and of intensive nurse-led education on the quality of bowel preparation prior to diagnostic colonoscopies
Secondary ID [1] 298765 0
Universal Trial Number (UTN)
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
Bowel preparation for colonoscopy 313701 0
Condition category
Condition code
Oral and Gastrointestinal 312116 312116 0 0
Other diseases of the mouth, teeth, oesophagus, digestive system including liver and colon

Study type
Description of intervention(s) / exposure
Arm 1: Standard care.
Patients were prescribed a 3-litre split-dose PEG bowel preparation and a 12-page colour information booklet (Princess Alexandra Hospital resource: "Preparing for your colonoscopy")was mailed to them a month prior to the procedure.

Arm 2: Reward.
As per standard care plus offered a financial reward (an instant scratchie ticket for a state-wide lottery with a jackpot of up to $25,000) if they achieve a “good or very good” quality rating of the preparation.

Arm 3: Intensified education.
As per standard care (12-page education booklet mailed out a month prior to procedure) plus additional one-on-one education two weeks prior to their procedure, delivered by an endoscopy nurse over the phone (duration 5 to 20 minutes where bowel preparation instructions were reviewed, and patient's queries answered).
Intervention code [1] 315028 0
Comparator / control treatment
The control treatment is that of our standard care, as per explanation in Arm 1 (3 L PEG bowel preparation, 12-page instructional booklet).
Control group

Primary outcome [1] 320756 0
Quality of bowel preparation for their colonoscopy procedure (by using the Boston Bowel Preparation Scale)
Timepoint [1] 320756 0
At the time of patient's colonoscopy procedure
Secondary outcome [1] 372742 0
Polyp detection rate by polypectomy at the time of the procedure
Timepoint [1] 372742 0
At the time of patient's colonoscopy procedure (once pathology is processed
Secondary outcome [2] 373413 0
Adenoma detection rate by polypectomy at the time of procedure
Timepoint [2] 373413 0
Once pathology results become available post the colonoscopy procedure
Secondary outcome [3] 374274 0
SAGIS questionnaire score (overall score that is calculated based on upper and lower gastrointestinal symptoms that patient experiences)
Timepoint [3] 374274 0
At data analysis stage, once the study is concluded

Key inclusion criteria
Adults from the general gastroenterology clinic referred for an elective colonoscopy
Minimum age
18 Years
Maximum age
80 Years
Both males and females
Can healthy volunteers participate?
Key exclusion criteria
Significant cognitive or mental impairment
Known need for interventional procedures (e.g. resection of large polyps)
Language barriers

Study design
Purpose of the study
Educational / counselling / training
Allocation to intervention
Randomised controlled trial
Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
The trials nurse recruiting patients was totally unaware of the randomisation schedule that was held under lock and key by one of the researchers
Methods used to generate the sequence in which subjects will be randomised (sequence generation)
Block randomisation
Masking / blinding
Blinded (masking used)
Who is / are masked / blinded?

The people assessing the outcomes
Intervention assignment
Other design features
Not Applicable
Type of endpoint(s)
Statistical methods / analysis
t-tests, Pearson’s bivariate correlations., chi-square, logistic regression

Recruitment status
Stopped early
Data analysis
Data analysis is complete
Reason for early stopping/withdrawal
Lack of funding/staff/facilities
Participant recruitment difficulties
Date of first participant enrolment
Date of last participant enrolment
Date of last data collection
Sample size
Accrual to date
Recruitment in Australia
Recruitment state(s)
Recruitment hospital [1] 14245 0
Princess Alexandra Hospital - Woolloongabba
Recruitment postcode(s) [1] 27242 0
4102 - Woolloongabba

Funding & Sponsors
Funding source category [1] 303322 0
Name [1] 303322 0
PA Foundation
Address [1] 303322 0
199 Ipswich Rd, Woolloongabba, Queensland 4102
Country [1] 303322 0
Primary sponsor type
PA Foundation
199 Ipswich Rd, Woolloongabba, Queensland 4102
Secondary sponsor category [1] 303344 0
Name [1] 303344 0
Address [1] 303344 0
Country [1] 303344 0

Ethics approval
Ethics application status
Ethics committee name [1] 303856 0
Metro South Ethics Committee
Ethics committee address [1] 303856 0
Metro South Health HREC
Centres for Health Research
Level 7, Translational Research Institute
37 Kent Street
Woolloongabba QLD 4102
Ethics committee country [1] 303856 0
Date submitted for ethics approval [1] 303856 0
Approval date [1] 303856 0
Ethics approval number [1] 303856 0

Brief summary
Research Aims:
To test the effect of a patient reward system (Instant scratchie lottery ticket) or augmented education improves:
a) quality of bowel preparations
b) and the polyp detection rate
To test whether the total SAGIS score correlates with the number of polyps found

Research Design & Methods to Achieve Aims:
During one calendar year 300 outpatients referred for a colonoscopy will be recruited who have consented to the study. The quality of bowel preparation will be scored via the Boston bowel preparation scale, which is the most extensively validated scoring system. Block randomisation will be used to allocate all patients consented on a given day into one of three treatment groups (Scratchie ticket lottery ticket reward vs. no reward vs. intensified education).
Trial website
Trial related presentations / publications
Public notes

Principal investigator
Name 95034 0
Prof Gerald Holtmann
Address 95034 0
Princess Alexandra Hospital
199 Ipswich Rd,
Woolloongabba, Qld, 4102
Country 95034 0
Phone 95034 0
+617 3176 2613
Fax 95034 0
Email 95034 0
Contact person for public queries
Name 95035 0
Prof Gerald Holtmann
Address 95035 0
Princess Alexandra Hospital
199 Ipswich Rd,
Woolloongabba, Qld, 4102
Country 95035 0
Phone 95035 0
+617 3176 2613
Fax 95035 0
Email 95035 0
Contact person for scientific queries
Name 95036 0
Prof Gerald Holtmann
Address 95036 0
Princess Alexandra Hospital
199 Ipswich Rd,
Woolloongabba, Qld, 4102
Country 95036 0
Phone 95036 0
+617 3176 2613
Fax 95036 0
Email 95036 0

Data sharing statement
Will individual participant data (IPD) for this trial be available (including data dictionaries)?
No/undecided IPD sharing reason/comment
The consent form indicates that individual data will only be made available to the listed researchers.
What supporting documents are/will be available?
No other documents available
Summary results
Have study results been published in a peer-reviewed journal?
Other publications
Have study results been made publicly available in another format?
Other publication details
Citation type [1] 3193 0
Conference abstract
Citation/DOI/link/details [1] 3193 0
Kutyla M, von Hippell C, Whaley A, Jones MP, Holtmann GJ. Sa1046 Improving the quality of bowel preparation: rewarding patients for success of intensive patient education? Gastrointest Endosc. 2018;87(6, Supplement):AB158.
Results – basic reporting
Results – plain English summary