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).