Repeatability of a Short Food Frequency Questionnaire to Assess Calcium Intake in Older Australians
Table 2
Median (IQR) estimated daily total calcium intake, intraclass correlation coefficients (ICC), and confidence interval (95% CI) of repeated administration of the 35-item and 15-item Flinders Calcium Food Frequency Questionnaire () in study participants (65 years).
Categories of items (number of items in each category)
Estimated daily total calcium intake (mg)
ICC
95% CI
[Median (IQR)]
[Median (IQR)]
Lower
Upper
35 items
Milk-based beverages (7); dairy products including cheese, yoghurt and dairy-based dessert (13); bread and breakfast cereals (8); volume of milk added to beverages, breakfast cereals and porridge (5); type of milk used (1); type of bread used (1)
810 (576, 1100)
824 (589, 1136)
0.5
0.27
0.59
15 items
As original 35-item FFQ with exclusion of bread & breakfast cereals (8); volume of milk added to breakfast cereals and porridge (2); type of bread used (1). Replace volume of milk added to beverages (3) and all milk-based beverages (7) with single item in estimation of overall daily milk consumption
