Factor loadings and α if item deleted for each item in primary model of knowledge domain (before deleting any items)

Items	Factor loading	Cronbach’s α if item deleted
1. A balanced meal plan is a plan in which appropriate amounts of each food group is used.	0.236	0.694
2. Which of the following foods is not included in dairy food group?	0.284	0.691
3. Which of the following options is equal to one serving of grains food group?	0.333	0.689
4. Which of following nutrients are mainly provided by meat group?	0.263	0.692
5. During pregnancy, how does daily requirement of meat (white and red meat) consumption change?	0.258	0.692
6. Legumes are not the good sources of proteins.	0.303	0.690
7. Which of following foods are good sources of Calcium?	0.203	0.695
8. Which of following nutrients do provide energy to our body?	0.525	0.676
9. Red meat, poultry and eggs are good sources of …….	0.295	0.691
10. Trans fatty acids are fatty acids which ……	0.560	0.673
11.Which of the followings is the best time to add iodized salt to food?	0.324	0.689
12. Obesity and being overweight during young age is not associated with diabetes in older ages.	0.425	0.682
13. Osteoporosis occurs as people grow older and cannot be prevented.	0.319	0.692
14. If you don’t have enough money to buy meat, which of following foods will be a more appropriate alternative?	0.218	0.694
15. Which of following cuts of meat has more fat?	0.317	0.689
16. In which of the following places you can buy fruits and vegetables with a lower price??a	0.072	0.705
17. Raw meat can be preserved in fridge for one week.	0.286	0.691
18. Among the cooking methods of meat, barbequing is the healthiest method.a	0.129	0.699
19. In which of the following cooking methods, nutritional values of vegetables are better maintained?	0.423	0.683
20. Production of 1 kilogram wheat requires more water than production of 1 kilogram of red meat (beef).	0.270	0.691
21. The difference between pasteurized and sterilized milks is in heating method and the temperature used.	0.299	0.691
22. Consumption of animal foods harms environment less than plant foods.	0.394	0.685
23. Using food products which are produced locally can help environmental sustainability.	0.209	0.694
24. Global warming could affect people’s access to adequate and healthy foods.	0.467	0.680
25. Production of plant foods compared with animal foods results in equal amount of greenhouse gas emission.	0.403	0.684
26. Imagine you enter a supermarket to choose a healthy snack, which of the following snacks is the healthiest choice?	0.350	0.688
27. If you are asked to choose the healthiest among the followings to prepare a food, which one will you select?	0.374	0.688
28.Body mass index (BMI) of a person who weighs 64 Kg and is 170 cm tall equals to:	0.327	0.691
29. An adult person has a BMI of 27; How do you evaluate his weight status? He she is	0.450	0.684

KaiserMeyerOlkin (KMO) was 0.710. P value for Bartlett’s Test of Sphericity was <0.001 (χ²=1048.55, Degree of freedom=406). Croanbach’s α for primary model of knowledge domain=0.697. ^aThese items were deleted in final model of knowledge domain because oflow factor loading and increasing alpha