Condition category
Date applied
Date assigned
Last edited
Prospectively registered
Overall trial status
Recruitment status
No longer recruiting

Plain English Summary

Background and study aims
Colorectal cancer is the first and second most common cancer among male and female respectively in Hong Kong. In September 2016, the Department of Health launched a three-year voluntary colorectal cancer screening pilot programme in Hong Kong and subsidised eligible Hong Kong Chinese to undergo fecal immunochemical tests (FIT). Despite the success of the programme in the detection of adenoma and adenocarcinoma (cancer), the overall screening participation rate in the programme was only 8.3%. The decision on whether to go for a test or not could be related to a few reasons or factors that influence individuals’ behaviours. In 2019, the implementation of Government-subsidised colorectal cancer screening programme to Hong Kong Chinese has been regularized and whether such subsidies will change people’s intention and their final decision on whether to participate in the screening or not still remain unknown. In order to inform further health-promoting intervention and enhance the screening uptake, it is necessary to understand the participation of colorectal cancer screening among asymptomatic Chinese and the associated factors.
Aim of the study: To assess the colorectal cancer screening participation among the asymptomatic average-risk population of HK Chinese aged 50 to 75 and to identify the association between predisposing, enabling and need factors, personal health practice and colorectal cancer screening participation.

Who can participate?
Hong Kong Chinese aged 50 to 75 years with no history of colorectal cancer

What does the study involve?
Participants will take part in a telephone survey regarding their general health

What are the possible benefits and risks of participating?
The study finding may help to improve understanding of the influence of individual and community factors on Hong Kong Chinese in the use of colorectal cancer screening. The findings may also inform the revision of current promoting strategies and intervention to increase and enhance colorectal cancer screening uptake. There are no risks.

Where is the study run from?
Faculty of Medicine, The Chinese University of Hong Kong

When is the study starting and how long is it expected to run for?
August 2019 to June 2020

Who is funding the study?
Faculty of Medicine, The Chinese University of Hong Kong

Who is the main contact?
Dr Dorothy Chan

Trial website

Contact information



Primary contact

Dr Dorothy Chan


Contact details

Rm 812
Esther Lee Building
The Chinese University of Hong Kong
Hong Kong
+852 39438165

Additional identifiers

EudraCT number

Nil known number

Nil known

Protocol/serial number


Study information

Scientific title

Participation in colorectal cancer screening among asymptomatic average-risk Chinese aged 50 to 75: A population-based survey


Study hypothesis

To explore the factors associated with colorectal cancer screening behavior

Ethics approval

Approved 19/08/2019, Ethics committee of the Joint Chinese University of Hong Kong - New Territories East Cluster (8/F, Lui Che Woo Clinical Sciences Building, Prince of Wales Hospital, Shatin, Hong Kong SAR, NT, China; +852 2144 5926), ref: 2019.396

Study design

Cross-sectional study

Primary study design


Secondary study design

Cross sectional study

Trial setting


Trial type


Patient information sheet

Not available in web format, please use the contact details below to request a patient information sheet


Colorectal cancer


Participants will be recruited via telephone using random sampling. A random digit dialling approach will be used to ensure that households in different districts and individuals have an equal opportunity to be contacted. Any respondent meeting the inclusion criteria will be invited to join the study. For any household with more than one respondent, the respondent with the birthday closest to the interview date will be invited to join. When a number cannot be reached at the first attempt, at least two more attempts will be made at different times on various days of the week.

The study will involve a structured survey guided by the Andersen Behavioral Model in data collection. The survey consists of five sections, namely:
1. Socio-demographic data (predisposing and enabling factors)
2. Perceived and evaluated health status
3. Personal health practice
4. Screening intention and participation
5. Health beliefs
(Chinese version of the survey will be used in the study)

Data will be summarized and presented using appropriate descriptive statistics. Normality of continuous variables will be assessed using skewness and kurtosis statistics and graphically by normal probability plot. Appropriate transformations will be made on skewed variables to correct their skewness before being entered statistical analyses. The primary outcome variables of the study are uptakes of a colorectal cancer screening, namely FOBT and colonoscopy. Logistic regression will be used to examine influencing factors associated with each of the outcomes. Univariate analysis of each of the potential influencing factors associated with each of the outcomes will be performed using binary logistic regression. Those factors with p < 0.25 will be selected as candidate independent variables for multivariable logistic regression to delineate factors independently associated with each outcome. Subgroup analysis will also be done to reveal any difference between male and female participants. The goodness-of-fit of the final multivariable logistic regression models for each outcome will be assessed by Hosmer-Lemeshow test, the results of the model will be presented by the odds ratios (OR) and their associated 95% confidence intervals (CI) of the factors retained in the model.

Intervention type



Drug names

Primary outcome measure

Fecal occult blood test uptake and colonoscopy uptake assessed by medical history interview at baseline.

Secondary outcome measures

Intention to have fecal occult blood test assessed by interview at baseline

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. Hong Kong Chinese aged 50 to 75 years
2. Absence of symptoms suggestive of colorectal cancer, such as a change in bowel habits in the past month, melena, weight loss of more than 5 kilograms in the past six months
3. No history of colorectal cancer
4. Able to understand or communicate in Cantonese

Participant type

Healthy volunteer

Age group




Target number of participants


Participant exclusion criteria

1. Hearing impairment

Recruitment start date


Recruitment end date



Countries of recruitment

Hong Kong

Trial participating centre

The Chinese University of Hong Kong
Rm 812, 8/F Esther Lee Building The Chinese University of Hong Kong Shatin, NT
Hong Kong

Sponsor information


The Nethersole School of Nursing

Sponsor details

The Chinese University of Hong Kong
Hong Kong

Sponsor type




Funder type


Funder name

Faculty of Medicine, The Chinese University of Hong Kong

Alternative name(s)

Funding Body Type

Funding Body Subtype


Results and Publications

Publication and dissemination plan

Produce 2 manuscripts in a high-impact peer-reviewed journal and present in 3 international conferences

IPD sharing statement:
All data generated or analysed during this study will be included in the subsequent results publication

Intention to publish date


Participant level data


Basic results (scientific)

Publication list

Publication citations

Additional files

Editorial Notes

12/05/2020: The following changes have been made: 1. The overall trial end date has been changed from 30/04/2020 to 30/12/2020. 2. The intention to publish date has been changed from 30/08/2020 to 30/06/2021. 22/08/2019: Trial’s existence confirmed by Ethics committee of the Chinese University of Hong Kong