Table 2.

Internal reliability of index items (n = 3993).

Item	n 1	Item-Test Correlation	Cronbach’s Alpha Coefficient
1. Red meat	3760	0.60	0.74
2. Chicken	3649	0.60	0.74
3. Fish/shellfish	3987	0.38	0.77
4. Milk	3983	0.55	0.74
5. Spread	3979	0.41	0.76
6. Low-fat foods	3927	0.65	0.73
7. Fries	3991	0.45	0.75
8. Bread	3913	0.51	0.75
9. Fruit	3989	0.48	0.75
10. Vegetables	3988	0.35	0.76
11. Soft drinks	3987	0.47	0.75
12. Breakfast	3992	0.53	0.75
13. Fast food	3992	0.44	0.75
14. Added salt	3991	0.42	0.76
15. Low-salt foods	3818	0.50	0.75
Total HDHI score			0.76

¹ Participants who had completed at least 75% of the DHQ questions without imputed data.