Effectiveness of a preventive web-based advice for people at (familial) risk for type 2 diabetes.
Conditions
Interventions
The (web-based) intervention consists of:
1. Familial risk assessment, in addition to diabetes risk based on general risk factors, personal risk communication containing familial risk information an
2. Diabetes risk assessment based on general risk factors, personal risk communication and lifestyle recommendations (control group).
Sponsors
EMGO institute for Health and Care Research, VU University Medical Center, Amsterdam, the Netherlands
Eligibility
Inclusion criteria
Inclusion criteria: Healthy people from the general population aged 35-65 years will be recruited. Inclusion criteria: 1. 35 to 65 years; 2. Body Mass Index (kg/m2) ¡Ý 25; 3. People with or without a postive (at least 1 first degree relative) family history of diabetes; 4. Access to a computer and internet.
Exclusion criteria
Exclusion criteria: Exclusion criteria (assessed when people are invited for the study): 1. People with diagnosed diabetes type 1 or 2; 2. People unable to read and complete questionnaires in Dutch; 3. Hindus, Turks, Creoles and Moroccans, since these populations require a specific diabetes risk intervention, due to their higher than avarage risk of getting diabetes.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| 1. Mean physical activity level will be measured by the self-administered short version of the International Physical Activity Questionnaire (IPAQ). Time points: Baseline, 3 months; 2. Mean saturated fat intake using a validated short food frequency questionnaire, the short Fat list. Time points: Baseline, 3 months; 3. Testing for diabetes: the percentage of people who test for diabetes after the risk information and attitudes towards taking a yearly or regular test for diabetes. Time points: Baseline, 3 months. | — |
Secondary
| Measure | Time frame |
|---|---|
| 1. Body measures: Self-reported waist circumference, BMI (self-reported body weight and length). Time points: Baseline, 3 months; 2. Threat appraisal: people's perception about the severity of diabetes. Baseline, 1 week and 3 months; 3. Coping appraisal: Self-efficacy, response efficacy for fat intake and physical activity. Time points: Baseline, 1 week and 3 months; 4. Illness representations: Causal beliefs, and perceived personal control adapted from the revised form of the Illness Perception Questionnaire. Time points: Baseline, 1 week and 3 months; 5. Risk perception: perceived susceptibility. Time points: Baseline, 1 week and 3 months; 6. False reassurance: causal beliefs and risk perception will be used to assess false reassurance; 7. Intentions: Intentions to engage in behavioural activities (fat intake, physical activity). Time point: 1 week; 8. Psychological impact: diabetes risk worry. Time points: Baseline, 1 week and 3 months; 9. Perceived implications: perceived impact on autonomy, freedom of choice, responsibility, feelings of stigmatisation and discrimination, worries about confidentiality of the information, impact on family relationships, medicalisation, and practical aspects. Time point: 3 months. | — |
Contacts
Public ContactMiranda Pijl
P.O.Box 7057, VUMC
Outcome results
None listed