Table 3.

Item Test-Retest Reliability and Item Difficulty Index in the Knowledge Subscale of the FLitT in Low-Income Adults

Item (15 items)	Item Test-Retest Reliability (ICC) (n=75)	Item Difficulty Index (n=98)
Which food belongs to the fruit group?	0.83***	0.89
Which food belongs to the leafy green vegetable group?	0.72***	0.96
Which food belongs to the starchy vegetable group?	0.67***	0.86
Which food belongs to the protein group?	0.65***	0.74
Which food is a plant-based protein?	0.46**	0.65
Which food belongs to the dairy group?	0.31	0.72
Which food is the whole grain?	0.60***	0.77
Which food is a good source of fiber?	0.69***	0.75
Which food is a good source of iron?	0.67***	0.30
What food is a good source of calcium?	0.64***	0.77
Which cow’s milk has the least fat?	0.70***	0.62
Which meat has the least fat?	0.70***	0.32
How many calories are in the whole container of soda?	0.50**	0.11
How many grams of sugar are in 1 serving of soda?	0.72***	0.55
Based on the unit price, which one is less expensive?	0.49**	0.32

^*P <0.05;

^**P <0.01;

^***P <0.001