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Table 3 Characteristics of included trials

From: Enhancing adherence in trials promoting change in diet and physical activity in individuals with a diagnosis of colorectal adenoma; a systematic review of behavioural intervention approaches

Author, pub date and location

Trial name and acronym

Eligibility criteria

Type of intervention

Trial duration and number of participants recruited

Run in phase

ITT analysis

Characteristics of participants

Summary of trial findings as reported in publication

Smith Warner 2000 31

Minnesota cancer prevention research unit diet intervention trial–Minnesota CPRU

Diet

12 months n = 100

No

Yes

Mean age 59 years

Individuals at high risk for development of colorectal cancer can successfully increase F&V intake and maintain that increase over a year period.

USA

30-74 years with a diagnosis of colorectal polyps in preceding 5 years, no medical conditions or chronic disease.

    

71 % male, 99 % Caucasian, mean number of years in education was 15

Lanza 2001 32

Polyp Prevention Trial–PP trial

Diet

4 years n = 1037

Yes, 4 day food record and frequency survey

Yes

Mean age 61 years

Free-living individuals can alter their eating patterns in a significant way given appropriate support

USA

≥35 years having removal of ≥ 1 colorectal adenomas removed within past 6 months, no history of colorectal cancer

    

66 % male, 12 % minority race, 65 % higher than high school education

Emmons 2005 33

Project PREVENT

Diet and physical activity

8 months n = 591

No

Yes

46 % aged 40–59 years and 54 % aged over 60 years

PREVENT was effective in helping adenoma patients to change and reduce behavioral risk factors and behavioral change is possible in this population

USA

40-65 years with a adenomatous colon polyp removed within 4 weeks of recruitment, no history of colorectal cancer

    

56 % male,83 % white, non Hispanic, 74 % higher than high school education

Caswell 2009 34

Bowel Health to Better Health–BHBH

Diet and physical activity

12 weeks n = 41

No

Not explicit

Mean age 62 years

Population is responsive to minimal contact intervention to promote positive change in diet

UK

50-74 years

    

71 % male, 100 % Caucasian

 

≥1 colorectal adenoma, no evidence of colorectal carcinoma or metaplastic or hyperplastic non-adenomatous polyps

    

Index of multiple deprivation low 20 %, medium 40 %, high 40 %

Anderson 2014

UK 35

BeWEL, 50–74 years, undergone polypectomy for adenoma, able to undertake physical activity

Diet and physical activity

12 months n = 163

No

Yes

Mean age 63.5 years, 74 % male,

100 % white,

86 % equal to higher than secondary school education

Significant weight loss can be achieved by a diet and physical activity intervention initiated within a national colorectal cancer screening programme