Predictors
We searched the FFQs for frequently consumed sources of calcium, using
the Dutch Nutrient Database (NEVO) (20) as a reference for information
on nutritional values, and the Dutch National Food Consumption survey
(7) for information on frequently consumed sources of calcium by women
of reproductive age. Food categories that are listed as a main dietary
source of calcium (e.g., cheese, milk) were included as potential
predictors, along with subcategories that had higher calcium contents
than the total category average (e.g., low fat cheese contains more
calcium than the average kind of cheese,). Predictors were included in
statistical analysis when the calcium content for each product serving
was at least 10% of the RDI (100 of 1000mg/day).