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Nordic Monitoring of diet, physical activity and overweight

Validation of indicators

image of Nordic Monitoring of diet, physical activity and overweight

In 2007, a Nordic working group was established with the aim to describe a future Nordic monitoring system on diet, physical activity and overweight.The monitoring system should be simple and at relatively low cost. Therefore it has been decided to conduct the moni-toring as a telephone interview. In 2009, the indicator questions were validated against an objective method (physical activity) or existing survey methods (diet) and the present report mainly describes the validation studies. On basis of the validation studies the working group suggests that the indicators are used in a future monitoring system. In 2011 and 2013 the first collection of data in all Nordic countries will take place.

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Validation – part 2 of the project

Validity describes the degree to which a method measures what it is designed to measure. Validation can be done in different ways, but normally the method in question is validated against a reference method, e.g. relatively against another subjective method or against objective measures. When conducting a validation study information on the feasibility of the method will also be taken into consideration. If the aim of validation is to examine if the selected indicator questions work the same way in each country, then validation must be done against the same reference method in all countries (e.g. validation of diet indicators against 7 day weighed record and physical activity indicators against accelerometry). If the aim of the validation is to examine how the indicators work within a country, then the validation can be done with different reference methods (e.g. diet indicators against food records or 24 h recall).

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