Table 1.

Difficulty index of the knowledge items

	questions	difficulty index
1	The corona virus survives on skin, nasal mucosa and saliva	87.6%
2	Handwashing before cooking can be prevented the transmission of COVID-19	94.8%
3	Raw and cooked foods should be kept separate in the refrigerator	91.4%
4	The Corona virus does not survive in the freezer	20.4%
5	The corona virus inactivated at cooking temperature (above 60° C)	77.2%
6	The cutting board of raw and cooked food should be separated	87.1%
7	Corona virus transmits through eating food	50.7%