Table 1 Factor, factor loading, content validity index, content validity ratio and impact score of the instrument items developed (n = 300).

From: Determinants of COVID-19 preventive health behaviors in Iranian adults based on extended parallel process model

Items

Factor

CVI

CVR

Impact score

1

2

3

4

5

6

7

8

9

Wearing a mask may prevent getting infected with COVID-19

0.888

        

1

1

4.7

Washing your hands regularly with soap and water or disinfecting them can prevent infection with COVID-19

0.833

        

1

1

4.6

If I do the necessary health actions to prevent COVID-19, I will be less likely to get this disease

0.828

        

1

1

4.7

If all members of the society do not leave the house unnecessarily, the transmission cycle of COVID-19 virus will be interrupted

0.783

        

1

1

4.4

Maintaining a social distance (1.5–2 m) with others is effective in the prevention of COVID-19

0.770

        

1

1

4.6

Not participating in parties and ceremonies is an effective behavior in the prevention of COVID-19

0.761

        

1

1

4.8

Establishing proper ventilation in closed environments is an effective method in the prevention of COVID-19

0.742

        

1

1

4.7

I can do health behaviors to prevent COVID-19, wherever I am

 

0.808

       

1

1

4.4

I can tolerate the mask on my face

 

0.548

       

1

1

4.5

I can wash my hands with soap and water frequently, even though it is time-consuming

 

0.846

       

1

1

4.4

Even though I'm bored, I can avoid leaving the house when it's not necessary

 

0.852

       

1

1

4.5

I can maintain a suitable social distance with others (1.5–2 m) outdoors

 

0.869

       

1

1

3.9

I can say no to others to attend parties and events

 

0.772

       

1

1

4.3

I can create proper ventilation in closed environments around me even though the weather is cold

 

0.548

       

1

1

4.4

I am not at risk of infection with COVID-19

  

0.931

      

1

1

4.1

It is not possible that I will be infected with COVID-19

  

0.894

      

1

1

4.7

Only elderly people get infected with COVID-19

  

0.871

      

1

1

4.3

COVID-19 is a serious and dangerous threat due to the high speed of virus transmission

   

0.883

     

1

1

4.7

COVID-19 virus can affect the lungs

   

0.828

     

1

1

4.7

Covid-19 can be fatal

   

0.776

     

1

1

4.7

During the peak of the disease, it is difficult to access treatment for Covid-19

   

0.745

     

1

1

4.6

Covid-19 threatens the individuals’ mental health

   

0.662

     

1

1

4.6

I am willing to do health behaviors to prevent Covid-19

    

0.954

    

1

1

4.5

I have planned to do health behaviors to prevent infection with COVID-19

    

0.938

    

1

1

4.1

I intend to do health behaviors to prevent COVID-19

    

0.926

    

1

1

4.4

The messages and information about COVID-19 make me feel scared

     

0.967

   

1

1

4.5

For me, the messages and information about COVID-19 are scary

     

0.948

   

1

1

4.4

The messages and information about COVID-19 worry me

     

0.942

   

1

1

4.2

Performing health behaviors to prevent COVID-19 is good/bad

      

0.950

  

1

1

4.2

Performing health behaviors to prevent COVID-19 is effective/ineffective

      

0.916

  

1

1

4.2

Performing health behaviors to prevent COVID-19 is important/ unimportant

      

0.873

  

1

1

4.1

Performing health behaviors to prevent COVID-19 is useful/ worthless

      

0.853

  

1

1

4.3

I wash my hands several times a day with soap and water, and if soap and water are not available, I use alcohol

       

0.852

 

1

1

4.5

When I leave the house, I put on a mask

       

0.849

 

1

1

4.5

I don't leave my home except when necessary

       

0.836

 

1

1

4.9

I maintain a social distance (1.5–2 m) outside the house and in contact with others

       

0.826

 

1

1

4.3

I avoid participating in events and parties

       

0.764

 

1

1

4.6

I go to medical centers when I experience the symptoms of COVID-19 (such as fever and cough)

       

0.752

 

1

1

4.8

I listen to information and recommendations of health professionals about COVID-19

       

0.688

 

1

1

4.9

I try to create a proper ventilation in closed environments

       

0.619

 

1

1

4.5

The news and information presented about COVID-19 are trying to put pressure on me in their own way

        

0.948

1

1

4.2

Those who write about COVID-19 want to take control of me

        

0.947

0.85

1

3.2

COVID-19 is a misleading story

        

0.939

0.85

1

3.8

COVID-19 has been manipulative

        

0.926

1

1

4.1

I don't listen when information about COVID-19 is presented

        

0.902

1

1

3.7

I don't want to read about COVID-19

        

0.900

1

1

3.6

Information about COVID-19 has been overstated

        

0.895

1

1

3.9

COVID-19 has been overblown

        

0.889

1

1

3.9

The severity of COVID-19 has been exaggerated

        

0.888

1

1

3.9