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Published byClement Logan Modified over 8 years ago
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Nederland de Maat Genomen ‘Measuring the Netherlands’ - experiences from the Netherlands-
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Assignment Ministry of Public Health and Welfare Population-based study in order to estimate the prevalence of: (abdominal) obesity metabolic risk factors undiagnosed diabetes Target population: 18-70 years of age, nationally representative sample Target number: 10.000 respondents (for stratification purposes, especially SES)
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Challenge was to design the study in such a way that results would be generalizable to the general population So: Representative sample Large enough to say something about subgroups (power) High response! Characterisation of non-respondents High quality standardized measures Logistically feasible …..and….within budget!!
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Measurements Height, weight, waist/hip circumference Blood sample: total/HDL chol, triglyceride, fasting glucose, HbA1c ‘short’ questionnaire to fill in at home Measurements in the morning, 7-10 am, at a research center
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Communication Specially designed materials with photo’s of all types of people Recommendation letter of municipal health service Local radio, newspaper (tv) We informed general practitioners in the region
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General invitation scheme Letter with information and reply card -Send back reply: are you willing to participate? -If yes invitation + questionnaire -If no please answer non-response questions -If not returned: reminder after 3 weeks »If still no reaction telephone calls, max. 6 times »If no contact second (last) reminder Incentive 10 euro’s (+ simple breakfast) Examination center open 7-10 am Mo-Sat (fasting blood)
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Sample Pilot: May (Tilburg) First fase: Oct-Dec Vlaardingen Oudewater Groningen Haarlemmermeer
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Crude division of types of response 11.000 persons invited -30 % examined -30 % actively refused 2300 were willing to answerl non-response questions -40% was never reached -for 70% of those never reached no telephone number could be found!
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New approach: 2 locations maximum effort Invitation + reply card 5 euro included in invitation letter If no reaction: reminder
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New approach: 2 locations maximum effort Invitation + reply card 5 euro included in invitation letter If no reaction: reminder If no reaction still door-knocking to invite people, -Measure height and weight -if they are not willing try to get them answering the non- response questions -If not, estimate BMI (rough categories normal/overweight/severly overweight)
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New approach Incentive to come to the center: 50 euro Research center open whole day+evening, our preference is fasting blood Exclude the 18-29 year olds. -Design a separate strategy to reach this group Add an ‘interesting measurement’? (cost, meaning,..)
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….approval from medical ethical committee….
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Communication Publicity: more than before -poster in supermarkets, -local newspapers/radio/TV, -use quotes from previous respondents and general practitioner in invitation brochure -use quote of general practitioner in invitaion brochure -trigger on the envelop
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Communication ‘How to sell a health survey to the public?’
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