Trial registered on ANZCTR

Trial ID
Ethics application status
Date submitted
Date registered
Date last updated
Type of registration
Retrospectively registered

Titles & IDs
Public title
Beijing Adolescent Obesity Peer Education
Scientific title
A pilot study to evaluate the feasibility and acceptability of a school-based peer education obesity program in adolescents in Beijing, China
Secondary ID [1] 280306 0
Nil known
Universal Trial Number (UTN)
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
Obesity 286265 0
Condition category
Condition code
Public Health 286486 286486 0 0
Health promotion/education
Diet and nutrition 286520 286520 0 0

Study type
Description of intervention(s) / exposure
Intervention (September 2010 to December 2010):
1. Peer leaders recruitment and training
After the baseline assessment, four to eight peer leaders balanced by gender in each intervention class were selected by the class teacher from volunteer students based on their organization and oral expression ability, influence among students and sense of responsibility.
Then peer leaders in each intervention school were trained by research staff in three after-school 90-minute workshops over 3 consecutive days at school. The training covered four components: food choice, physical activity and sedentary behavior, carbonated drinks, and goal setting, which directly aimed at behavior change.
2. Peer education
Peer leaders then delivered four 40-minute peer education lessons to their classmates over four consecutive weeks in their classrooms.
3.Student action
Students were encouraged to maintain a healthy lifestyle based on the personal goals set in the fourth peer education lesson.
Intervention code [1] 284656 0
Intervention code [2] 284677 0
Intervention code [3] 284678 0
Comparator / control treatment
No intervention was implemented in the two control schools during the study.
Control group

Primary outcome [1] 286929 0
Feasibility and acceptability of the peer education project that was evaluated by observing the peer education activities, in-depth interview with school teachers, focus group discussion with peer leaders and peers, semi-structural questionnaires. The evaluation was implemented by trained research staff.
Timepoint [1] 286929 0
Baseline: September 2010
On completion of intervention at 3 months: December 2010
Follow-up at 7-8 months: April-May 2011
Secondary outcome [1] 297010 0
Dietary behavior that was evaluated by validated 3-month Food Frequency Questionnaire
Timepoint [1] 297010 0
Baseline: September 2010
On completion of intervention at 3 months: December 2010
Follow-up at 7-8 months: April-May 2011
Secondary outcome [2] 297047 0
physical activity that was evaluated by validated 7-day physical activity questionnaire
Timepoint [2] 297047 0
Baseline: September 2010
On completion of intervention at 3 months: December 2010
Follow-up at 7-8 months: April-May 2011
Secondary outcome [3] 297048 0
Psychosoical mediators were evaluated by psychosocial mediators questionnaire on dietary behavior and physical activity
Timepoint [3] 297048 0
Baseline: September 2010
On completion of intervention at 3 months: December 2010
Follow-up at 7-8 months: April-May 2011

Key inclusion criteria
Students in grade 7 in the four junior high schools that had at least 160 students in grade 7
Minimum age
11 Years
Maximum age
16 Years
Both males and females
Can healthy volunteers participate?
Key exclusion criteria
Those with disease that influence energy metabolism

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)
A convenience sample of two small-sized and two large-sized junior high schools in Dongcheng District, Beijing were selected by the Dongcheng District Institute for Student Healthcare from schools with more than 160 students in grade 7. These schools were matched by school population size, and in each matched pair, one school was randomly allocated by research staff by throwing a coin to intervention or the control group. The allocation is not concealed.
Methods used to generate the sequence in which subjects will be randomised (sequence generation)
Masking / blinding
Blinded (masking used)
Who is / are masked / blinded?

Intervention assignment
Other design features
Type of endpoint(s)
Statistical methods / analysis

Recruitment status
Date of first participant enrolment
Date of last participant enrolment
Date of last data collection
Sample size
Accrual to date
Recruitment outside Australia
Country [1] 4251 0
State/province [1] 4251 0

Funding & Sponsors
Funding source category [1] 285075 0
Name [1] 285075 0
The Nestle Foundation
Address [1] 285075 0
Place de la Gare 4, PO Box 581, 1001 Lausanne
Country [1] 285075 0
Primary sponsor type
The George Institute for Global Health, China
Room B1302, Horizon Tower, No 6, Zhichun Road, Haidian District, Beijing 100088, PR China
Secondary sponsor category [1] 283938 0
Name [1] 283938 0
The University of Sydney
Address [1] 283938 0
NSW 2006
Country [1] 283938 0

Ethics approval
Ethics application status
Ethics committee name [1] 287086 0
The Peking University Biomedical Ethics Committee
Ethics committee address [1] 287086 0
38 Xueyuan Road , Haidian District, Beijing 100191
Ethics committee country [1] 287086 0
Date submitted for ethics approval [1] 287086 0
Approval date [1] 287086 0
Ethics approval number [1] 287086 0
IRB00001052 - 09077
Ethics committee name [2] 287087 0
Human Research Ethics Committee, The University of Sydney, Australia
Ethics committee address [2] 287087 0
NSW 2006
Ethics committee country [2] 287087 0
Date submitted for ethics approval [2] 287087 0
Approval date [2] 287087 0
Ethics approval number [2] 287087 0

Brief summary
With economic development over the last decade, China is undergoing a rapid nutrition transition from under- to over-nutrition, especially in urban areas. The China National Nutrition surveys indicate that the prevalence of obesity of children and adolescents aged 7-17 years in urban areas has increased by 42% from 3.1% in 1992 to 4.4% in 2002 according to Chinese screening criteria. The situation is even worse in Beijing, the capital of China. The latest data in 2004 indicate that prevalence of obesity in adolescents aged 13-15 in urban Beijing has reached 11% according to Chinese screening criteria. As the prevalence of adolescent overweight and obesity continues to rise, the need for feasible and effective prevention is becoming increasingly urgent.
The best available evidence indicates a lack of established and effective preventive interventions for adolescent obesity around the world. It is well recognized that peers are an important influence on health related behaviour and a key source of information for young people. Promotion of healthy eating and physical activity by peers is more likely to be accepted than promotion by authority figures like parents and teachers. Recent studies have shown peer education programs can significantly improve a range of health behaviours, including increasing fruit intake and reducing the risk of eating disorders in primary school students as well as improving clinical and quality of life indicators in adolescents with asthma. However, little is known about whether this premise holds for educating junior high school students about obesity-related behaviors like dietary and physical activity.
The proposed pilot study aims to evaluate the feasibility of innovative peer-led interventions in students in grade 7 in 2 intervention and 2 control junior high schools in urban Beijing, based on theory and prior research and provide scientific basis for the development of formal intervention studies in future.
Trial website
Trial related presentations / publications
Public notes

Principal investigator
Name 34049 0
Address 34049 0
Country 34049 0
Phone 34049 0
Fax 34049 0
Email 34049 0
Contact person for public queries
Name 17296 0
Zhaohui Cui
Address 17296 0
Room B1302, Horizon Tower, No 6, Zhichun Road, Haidian District, Beijing 100088, PR China
Country 17296 0
Phone 17296 0
Fax 17296 0
Email 17296 0
Contact person for scientific queries
Name 8224 0
Zhaohui Cui
Address 8224 0
Room B1302, Horizon Tower, No 6, Zhichun Road, Haidian District, Beijing 100088, PR China
Country 8224 0
Phone 8224 0
Fax 8224 0
Email 8224 0